Standard Lemma guide

signal

adj · noun · verb · 20 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • sĭgʹnəl
  • /ˈsɪɡnəl/
  • US: Recorded audio is listed in the source snapshot.
  • rhymes with -ɪɡnəl
  • CMU ARPABET: S IH1 G N AH0 L Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

adj

Meaning 1

Standing above others in rank, importance, or achievement.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

Examples

  • a signal exploit; a signal success; a signal act of benevolence

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

A sequence of states representing an encoded message in a communication channel.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

Any variation of a quantity or change in an entity over time that conveys information upon detection.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

noun

Meaning 4

A sign made to give notice of some occurrence, command, or danger, or to indicate the start of a concerted action.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

noun

Meaning 5

An on-off light, semaphore, or other device used to give an indication to another person.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

6

noun

Meaning 6

An on-off light, semaphore, or other device used to give an indication to another person.

A railway signal.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

7

noun

Meaning 7

An electromagnetic action, normally a voltage that is a function of time, that conveys the information of the radio or TV program or of communication with another party.

Definition source: English Wiktionary via Wiktextract

Usage: Internet, TV, usually

Topics: communications, electrical-engineering, engineering, natural-sciences, physical-sciences, telecommunications, telephone, telephony

Examples

  • My mobile phone can't get a signal in the railway station.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

8

noun

Meaning 8

An action, change or process done to convey information and thus reduce uncertainty.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

9

noun

Meaning 9

A token; an indication; a foreshadowing; a sign.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

10

noun

Meaning 10

Useful information, as opposed to noise.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

11

noun

Meaning 11

A simple interprocess communication used to notify a process or thread of an occurrence.

Definition source: English Wiktionary via Wiktextract

Usage: Unix

Topics: computing, engineering, mathematics, natural-sciences, physical-sciences, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

12

noun

Meaning 12

A signalling interaction between cells

Definition source: English Wiktionary via Wiktextract

Topics: biochemistry, biology, chemistry, microbiology, natural-sciences, physical-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

13

verb

Meaning 13

To indicate; to convey or communicate by a signal.

Definition source: English Wiktionary via Wiktextract

Usage: ambitransitive

Examples

  • I signalled my acquiescence with a nod.
  • He whistled to signal that we should stop.
  • My arms wheeled frantically in the air as I tried to signal for help.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

14

verb

Meaning 14

To communicate with (a person or system) by a signal.

Definition source: English Wiktionary via Wiktextract

Usage: transitive

Examples

  • Seeing the flames, he ran to the control room and signalled headquarters.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

15

adjective satellite

Meaning 15

notably out of the ordinary

Definition source: Princeton WordNet 3.0

Examples

  • the year saw one signal triumph for the Labour party

Meaning relationships

Synonyms: none provided

Antonyms: none provided

16

noun

Meaning 16

any nonverbal action or gesture that encodes a message

Definition source: Princeton WordNet 3.0

Examples

  • signals from the boat suddenly stopped

Meaning relationships

Synonyms: signaling, sign

Antonyms: none provided

Broader terms: communication

Narrower terms: recording, phone number, telephone number, number, starting signal, start, storm signal, radio beam, beam, ticktack, time signal, dog-ear, animal communication, alarm, alert, warning signal, alarum, distress signal, distress call, all clear, bugle call, curfew, retreat, drumbeat, telegraphic signal, radiotelegraphic signal, whistle, whistling, high sign, symbol, visual signal, indicator, electronic signal, radio beacon, input signal, input, output signal, output

17

noun

Meaning 17

any incitement to action

Definition source: Princeton WordNet 3.0

Examples

  • he awaited the signal to start
  • the victory was a signal for wild celebration

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: incitement, incitation, provocation

18

noun

Meaning 18

an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: electricity, electrical energy

Narrower terms: interrupt

19

verb

Meaning 19

be a signal for or a symptom of

Definition source: Princeton WordNet 3.0

Examples

  • These symptoms indicate a serious illness
  • Her behavior points to a severe neurosis
  • The economic indicators signal that the euro is undervalued

Meaning relationships

Synonyms: bespeak, betoken, indicate, point

Antonyms: none provided

Broader terms: tell

Narrower terms: bode, portend, auspicate, prognosticate, omen, presage, betoken, foreshadow, augur, foretell, prefigure, forecast, predict, mark

20

verb

Meaning 20

communicate silently and non-verbally by signals or signs

Definition source: Princeton WordNet 3.0

Examples

  • He signed his disapproval with a dismissive hand gesture
  • The diner signaled the waiters to bring the menu

Meaning relationships

Synonyms: sign, signalize, signalise

Antonyms: none provided

Broader terms: communicate, intercommunicate

Narrower terms: wigwag, semaphore, heliograph, flag, whistle

History

Etymology

From Old French segnal, seignal or Medieval Latin signāle; noun use of the neuter of Late Latin signālis, from Latin signum; verb use from 1805, as a shortened from signalize (1650s). Doublet of signum and sign.

Across languages

Translations

205 source translations are retained for this English entry.

  • Albanian: sinjal — sign made to give notice
  • Arabic: إِشَارَة (ʔišāra) — sign made to give notice
  • Armenian: ազդանշան (azdanšan) — sign made to give notice
  • Armenian: ազդակ (azdak) — sign made to give notice
  • Azerbaijani: siqnal — sign made to give notice
  • Azerbaijani: işarə — sign made to give notice
  • Belarusian: сігна́л (sihnál) — sign made to give notice
  • Belarusian: сыгна́л (syhnál) — sign made to give notice
  • Belarusian: знак (znak) — sign made to give notice
  • Bengali: ইশারা (iśara) — sign made to give notice
  • Bengali: সংকেত (śoṅket) — sign made to give notice
  • Bulgarian: сигна́л (signál) — sign made to give notice
  • Burmese: လက္ခဏာ (lakhka.na) — sign made to give notice
  • Catalan: senyal — sign made to give notice
  • Chinese Mandarin: 信號 /信号 (xìnhào) — sign made to give notice
  • Chinese Mandarin: 訊號 /讯号 (xùnhào) — sign made to give notice
  • Czech: znamení — sign made to give notice
  • Czech: signál — sign made to give notice
  • Danish: signal — sign made to give notice
  • Dutch: signaal — sign made to give notice
  • Dutch: sein — sign made to give notice
  • Esperanto: signalo — sign made to give notice
  • Estonian: signaal — sign made to give notice
  • Finnish: merkki — sign made to give notice
  • Finnish: signaali — sign made to give notice
  • French: signal — sign made to give notice
  • Galician: sinal — sign made to give notice
  • Georgian: სიგნალი (signali) — sign made to give notice
  • German: Signal — sign made to give notice
  • Greek: σήμα (síma) — sign made to give notice
  • Hebrew: אוֹת (ot) — sign made to give notice
  • Hebrew: סִיגְנָל (signál) — sign made to give notice
  • Hindi: संकेत (saṅket) — sign made to give notice
  • Hindi: इशारा (iśārā) — sign made to give notice
  • Hungarian: jel — sign made to give notice
  • Hungarian: jelzés — sign made to give notice
  • Hungarian: jeladás — sign made to give notice
  • Hungarian: index — sign made to give notice
  • Hungarian: szignál — sign made to give notice
  • Icelandic: merki — sign made to give notice
  • Indonesian: anggai — sign made to give notice
  • Indonesian: isyarat — sign made to give notice
  • Italian: segnale — sign made to give notice
  • Japanese: 信号 (shingō) — sign made to give notice
  • Japanese: 合図 (aizu) — sign made to give notice
  • Japanese: シグナル (shigunaru) — sign made to give notice
  • Kazakh: сигнал (signal) — sign made to give notice
  • Khmer: តម្រុយ (tɑmroy) — sign made to give notice
  • Khmer: សង្កេត (sɑɑsɑngkeet) — sign made to give notice
  • Khmer: សញ្ញា (saññaa) — sign made to give notice
  • Korean: 신호 (sinho) — sign made to give notice
  • Korean: 시그널 (sigeuneol) — sign made to give notice
  • Northern Kurdish: sînyal — sign made to give notice
  • Northern Kurdish: îşaret — sign made to give notice
  • Kyrgyz: сигнал (signal) — sign made to give notice
  • Lao: ສັນຍານ (san nyān) — sign made to give notice
  • Latvian: signāls — sign made to give notice
  • Lithuanian: signalas — sign made to give notice
  • Macedonian: сигнал (signal) — sign made to give notice
  • Malay: isyarat — sign made to give notice
  • Mongolian: дохио (doxio) — sign made to give notice
  • Mongolian: ᠳᠣᠬᠢᠶ᠎ᠠ (doqiy-a) — sign made to give notice
  • Norwegian Bokmål: signal — sign made to give notice
  • Norwegian Nynorsk: signal — sign made to give notice
  • Pashto: اشاره (ešārá) — sign made to give notice
  • Pashto: سيګنل (signál) — sign made to give notice
  • Pashto: زيګنال (zignãl) — sign made to give notice
  • Dari: اِشَارَه (išāra) — sign made to give notice
  • Iranian Persian: اِشارِه (ešâre) — sign made to give notice
  • Iranian Persian: سیگْنال (signâl) — sign made to give notice
  • Polish: sygnał — sign made to give notice
  • Portuguese: sinal — sign made to give notice
  • Romanian: semnal — sign made to give notice
  • Russian: сигна́л (signál) — sign made to give notice
  • Russian: знак (znak) — sign made to give notice
  • Serbo-Croatian: сѝгна̄л — sign made to give notice
  • Serbo-Croatian: sìgnāl — sign made to give notice
  • Slovak: znamenie — sign made to give notice
  • Slovak: signál — sign made to give notice
  • Slovene: signal — sign made to give notice
  • Spanish: señal — sign made to give notice
  • Swahili: ishara — sign made to give notice
  • Swedish: signal — sign made to give notice
  • Tajik: ишора (išora) — sign made to give notice
  • Tajik: ишорат (išorat) — sign made to give notice
  • Tajik: сигнал (signal) — sign made to give notice
  • Telugu: సంజ్ఞ (sañjña) — sign made to give notice
  • Telugu: సంకేతం (saṅkētaṁ) — sign made to give notice
  • Thai: สัญญาณ (sǎn-yaan) — sign made to give notice
  • Turkish: sinyal — sign made to give notice
  • Turkish: işaret — sign made to give notice
  • Ottoman Turkish: اشارت (işaret) — sign made to give notice
  • Turkmen: signal — sign made to give notice
  • Turkmen: yşarat — sign made to give notice
  • Ukrainian: сигна́л (syhnál) — sign made to give notice
  • Ukrainian: знак (znak) — sign made to give notice
  • Urdu: اِشارَہ (iśāra) — sign made to give notice
  • Uyghur: سىگنال (signal) — sign made to give notice
  • Uyghur: ئىشارەت (isharet) — sign made to give notice
  • Uzbek: signal — sign made to give notice
  • Uzbek: ishora — sign made to give notice
  • Vietnamese: tín hiệu — sign made to give notice
  • Yiddish: סיגנאַל (signal) — sign made to give notice
  • Bulgarian: семафо́р (semafór) — device to give indication
  • Catalan: senyal — device to give indication
  • Czech: signál — device to give indication
  • Danish: signal — device to give indication
  • Dutch: sein — device to give indication
  • Finnish: opastin — device to give indication
  • Finnish: merkinantolaite — device to give indication
  • French: signal — device to give indication
  • Galician: sinal — device to give indication
  • German: Signal — device to give indication
  • Hungarian: szemafor — device to give indication
  • Hungarian: jelzőberendezés — device to give indication
  • Italian: segnale — device to give indication
  • Norwegian Bokmål: signal — device to give indication
  • Norwegian Nynorsk: signal — device to give indication
  • Polish: sygnał — device to give indication
  • Portuguese: sinal — device to give indication
  • Romanian: semnal indicator — device to give indication
  • Romanian: semnalizator — device to give indication
  • Russian: семафо́р (semafór) — device to give indication
  • Spanish: señal — device to give indication
  • Swedish: signal — device to give indication
  • Bulgarian: сигна́л (signál) — telecommunication: electromagnetic action that conveys information
  • Catalan: senyal — telecommunication: electromagnetic action that conveys information
  • Chinese Mandarin: 信号 (xìnhào) — telecommunication: electromagnetic action that conveys information
  • Danish: signal — telecommunication: electromagnetic action that conveys information
  • Dutch: signaal — telecommunication: electromagnetic action that conveys information
  • Esperanto: signalo — telecommunication: electromagnetic action that conveys information
  • Finnish: signaali — telecommunication: electromagnetic action that conveys information
  • Galician: sinal — telecommunication: electromagnetic action that conveys information
  • Hungarian: jel — telecommunication: electromagnetic action that conveys information
  • Hungarian: rádiójel — telecommunication: electromagnetic action that conveys information
  • Hungarian: térerő — telecommunication: electromagnetic action that conveys information
  • Hungarian: térerősség — telecommunication: electromagnetic action that conveys information
  • Indonesian: sinyal — telecommunication: electromagnetic action that conveys information
  • Italian: segnale — telecommunication: electromagnetic action that conveys information
  • Italian: campo — telecommunication: electromagnetic action that conveys information
  • Japanese: 電波 (denpa) — telecommunication: electromagnetic action that conveys information
  • Korean: 전파 (jeonpa) — telecommunication: electromagnetic action that conveys information
  • Marshallese: bar — telecommunication: electromagnetic action that conveys information
  • Norwegian Bokmål: signal — telecommunication: electromagnetic action that conveys information
  • Norwegian Nynorsk: signal — telecommunication: electromagnetic action that conveys information
  • Portuguese: sinal — telecommunication: electromagnetic action that conveys information
  • Portuguese: rede — telecommunication: electromagnetic action that conveys information
  • Romanian: semnal — telecommunication: electromagnetic action that conveys information
  • Russian: сигна́л (signál) — telecommunication: electromagnetic action that conveys information
  • Spanish: señal — telecommunication: electromagnetic action that conveys information
  • Swedish: signal — telecommunication: electromagnetic action that conveys information
  • Turkish: sinyal — telecommunication: electromagnetic action that conveys information
  • Vietnamese: tín hiệu — telecommunication: electromagnetic action that conveys information
  • Esperanto: signalo — action, change or process to convey information
  • Spanish: señal — action, change or process to convey information
  • Bulgarian: знак (znak) — foreshadowing
  • Finnish: enne — foreshadowing
  • Finnish: ennusmerkki — foreshadowing
  • Indonesian: padah — foreshadowing
  • Indonesian: pertanda — foreshadowing
  • Portuguese: sinal — foreshadowing
  • Russian: знак (znak) — foreshadowing
  • Bulgarian: сигна́л (signál) — useful information as opposed to noise
  • Finnish: signaali — useful information as opposed to noise
  • Indonesian: isyarat — useful information as opposed to noise
  • Indonesian: sinyal — useful information as opposed to noise
  • Portuguese: sinal — useful information as opposed to noise
  • Russian: сигна́л (signál) — useful information as opposed to noise
  • Bulgarian: сигна́л (signál) — computing: simple interprocess communication
  • Dutch: signaal — computing: simple interprocess communication
  • Finnish: signaali — computing: simple interprocess communication
  • French: signal — computing: simple interprocess communication
  • Indonesian: sinyal — computing: simple interprocess communication
  • Russian: сигна́л (signál) — computing: simple interprocess communication
  • Belarusian: сігналізава́ць (sihnalizavácʹ) — to indicate
  • Bulgarian: сигнализирам (signaliziram) — to indicate
  • Danish: give signal — to indicate
  • Danish: signalere — to indicate
  • Finnish: viestittää — to indicate
  • Finnish: signaloida — to indicate
  • Finnish: opastaa — to indicate
  • French: signaler — to indicate
  • German: signalisieren — to indicate
  • Ancient Greek: σημειόω (sēmeióō) — to indicate
  • Hungarian: jelez — to indicate
  • Hungarian: jelt ad — to indicate
  • Hungarian: jelöl — to indicate
  • Hungarian: indexel — to indicate
  • Italian: segnalare — to indicate
  • Italian: indicare — to indicate
  • Lithuanian: signalizuoti — to indicate
  • Māori: rota — to indicate
  • Māori: rotarota — to indicate
  • Māori: whakapua — to indicate
  • Māori: hū — to indicate
  • Polish: sygnalizować — to indicate
  • Polish: zasygnalizować — to indicate
  • Russian: сигнализи́ровать (signalizírovatʹ) — to indicate
  • Russian: просигнализи́ровать (prosignalizírovatʹ) — to indicate
  • Sicilian: sincalijari — to indicate
  • Sicilian: sinnari — to indicate
  • Sicilian: nnicari — to indicate
  • Spanish: señalar — to indicate
  • Ukrainian: сигналізува́ти (syhnalizuváty) — to indicate
  • Ukrainian: просигналізува́ти (prosyhnalizuváty) — to indicate
Real reading context

signal in complete knowledge articles