Standard Lemma guide

IO

adj · intj · name · noun · 14 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.

  • Received-Pronunciation: /ˈaɪəʊ/
  • Southern-England: Recorded audio is listed in the source snapshot.
  • General-American: /ˈaɪoʊ/
  • rhymes with -aɪəʊ
  • /ˈaɪəʊ/
  • Southern-England: Recorded audio is listed in the source snapshot.
  • CMU ARPABET: AY1 OW0 Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

adj

Meaning 1

Abbreviation of intraosseous.

Definition source: English Wiktionary via Wiktextract

Usage: abbreviation, alt-of

Topics: emergency-medicine, medicine, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

intj

Meaning 2

An exclamation of joy or triumph.

Definition source: English Wiktionary via Wiktextract

Usage: rare

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

name

Meaning 3

The daughter of Inachus river god, and a lover of Zeus, turned by the latter into a heifer.

Definition source: English Wiktionary via Wiktextract

Usage: Greek

Topics: human-sciences, mysticism, mythology, philosophy, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

name

Meaning 4

A moon of Jupiter, known for its volcanic activity, peppered with about 400 active volcanoes.

Definition source: English Wiktionary via Wiktextract

Topics: astronomy, natural-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

name

Meaning 5

85 Io, a main belt asteroid; the asteroid shares its name with the Jovian moon

Definition source: English Wiktionary via Wiktextract

Topics: astronomy, natural-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

6

noun

Meaning 6

Initialism of input and output.

Definition source: English Wiktionary via Wiktextract

Usage: abbreviation, alt-of, countable, initialism, uncountable

Topics: business, computing, electrical-engineering, electricity, electromagnetism, electronics, energy, engineering, mathematics, natural-sciences, physical-sciences, physics, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

7

noun

Meaning 7

Initialism of indirect object.

Definition source: English Wiktionary via Wiktextract

Usage: abbreviation, alt-of, countable, initialism, uncountable

Topics: grammar, human-sciences, linguistics, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

8

noun

Meaning 8

Initialism of intelligence officer.

Definition source: English Wiktionary via Wiktextract

Usage: abbreviation, alt-of, countable, initialism, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

9

noun

Meaning 9

Initialism of incident officer.

Definition source: English Wiktionary via Wiktextract

Usage: abbreviation, alt-of, countable, initialism, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

10

noun

Meaning 10

Initialism of investigation officer.

Definition source: English Wiktionary via Wiktextract

Usage: Singapore, abbreviation, alt-of, countable, initialism, uncountable

Topics: government, law-enforcement

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

11

noun

Meaning 11

Initialism of international organization.

Definition source: English Wiktionary via Wiktextract

Usage: abbreviation, alt-of, countable, initialism, uncountable

Qualifier: international law

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

12

noun

Meaning 12

A type of moth, the io moth.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

13

noun

Meaning 13

the closest of Jupiter's moons; has active volcanoes

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: Galilean satellite, Galilean

14

noun

Meaning 14

(Greek mythology) a maiden seduced by Zeus; when Hera was about to discover them together Zeus turned her into a white heifer

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: maid, maiden

History

Etymology

From Latin iō; compare Ancient Greek ἰώ (iṓ, “oh!”).

Borrowed from Latin Io, from Ancient Greek Ἰώ (Iṓ).

From New Latin, from Ancient Greek Ἰώ (Iṓ, “Io”).

Across languages

Translations

50 source translations are retained for this English entry.

  • Catalan: Io — mythology
  • Chinese Mandarin: 伊俄 (Yī'é) — mythology
  • Czech: Íó — mythology
  • Danish: Io — mythology
  • Dutch: Io — mythology
  • Esperanto: Io — mythology
  • Finnish: Io — mythology
  • French: Io — mythology
  • Galician: Ío — mythology
  • Georgian: იო (io) — mythology
  • German: Io — mythology
  • Greek: Ιώ (Ió) — mythology
  • Ancient Greek: Ἰώ (Iṓ) — mythology
  • Italian: Io — mythology
  • Japanese: イーオー (Īō) — mythology
  • Korean: 이오 — mythology
  • Latin: Īō — mythology
  • Macedonian: Ија (Ija) — mythology
  • Norwegian Bokmål: Io — mythology
  • Norwegian Nynorsk: Io — mythology
  • Polish: Io — mythology
  • Portuguese: Io — mythology
  • Romanian: Io — mythology
  • Russian: Ио́ (Ió) — mythology
  • Serbo-Croatian: Ȉja — mythology
  • Serbo-Croatian: И̏ја — mythology
  • Serbo-Croatian: Ȉo — mythology
  • Serbo-Croatian: И̏о — mythology
  • Slovak: Ió — mythology
  • Slovene: Ió — mythology
  • Spanish: Ío — mythology
  • Ukrainian: Іо́ (Ió) — mythology
  • Arabic: آيُّو (ʔāyyū) — moon of Jupiter
  • Chinese Mandarin: 木衛一 /木卫一 (Mùwèiyī) — moon of Jupiter
  • Chinese Mandarin: 埃歐 /埃欧 (Āi'ōu) — moon of Jupiter
  • Danish: Io — moon of Jupiter
  • Dutch: Io — moon of Jupiter
  • Finnish: Io — moon of Jupiter
  • French: Io — moon of Jupiter
  • German: Io — moon of Jupiter
  • Greek: Ιώ (Ió) — moon of Jupiter
  • Icelandic: Íó — moon of Jupiter
  • Icelandic: Jó — moon of Jupiter
  • Italian: Io — moon of Jupiter
  • Japanese: イオ — moon of Jupiter
  • Korean: 이오 — moon of Jupiter
  • Polish: Io — moon of Jupiter
  • Portuguese: Io — moon of Jupiter
  • Russian: Ио́ (Ió) — moon of Jupiter
  • Spanish: Ío — moon of Jupiter