Standard Lemma guide

X

adj · character · conj · name · noun · num · verb · 25 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.

  • letter, name: /ɛks/
  • US: Recorded audio is listed in the source snapshot.
  • /ks/
  • /ɡz/
  • /kʃ/
  • /ɡʒ/
  • /z/
  • /ʃ/
  • US: Recorded audio is listed in the source snapshot.
  • rhymes with -ɛks
  • homophone: Exe
  • US: Recorded audio is listed in the source snapshot.
  • CMU ARPABET: EH1 K S Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

adj

Meaning 1

Intersex or non-binary (in passports and identification documents).

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

adj

Meaning 2

Suitable only for those aged sixteen or (later) eighteen years and over.

Definition source: English Wiktionary via Wiktextract

Usage: dated, not-comparable

Qualifier: UK film certificate

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

adj

Meaning 3

Obscene; adult; pornographic; XXX.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

adj

Meaning 4

Abbreviation of extreme.

Definition source: English Wiktionary via Wiktextract

Usage: abbreviation, alt-of, informal

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

adj

Meaning 5

Alternative letter-case form of X (“intersex or non-binary (in passports and identification documents)”).

Definition source: English Wiktionary via Wiktextract

Usage: alt-of, not-comparable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

6

character

Meaning 6

The twenty-fourth letter of the English alphabet, called ex and written in the Latin script.

Definition source: English Wiktionary via Wiktextract

Usage: letter, uppercase

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

7

character

Meaning 7

Forming gender-neutral or otherwise more inclusive versions of words, especially Spanish-derived words by replacing both the masculine -o and feminine -a.

Definition source: English Wiktionary via Wiktextract

Usage: letter, lowercase

Examples

  • alumnx, Chicanx (Xicanx), Filipinx, Latinx, Mx, mxn, Tejanx, womxn

Meaning relationships

Synonyms: none provided

Antonyms: none provided

8

conj

Meaning 8

Used between the names of two characters to denote a ship, particularly in anime, manga, and video games.

Definition source: English Wiktionary via Wiktextract

Usage: slang

Topics: lifestyle

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

9

conj

Meaning 9

Used in place of and in artist collaborations.

Definition source: English Wiktionary via Wiktextract

Topics: entertainment, lifestyle, music

Examples

  • Taska Black x DROELOE, Steve Aoki x Lauren Jauregui, etc.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

10

name

Meaning 10

A placeholder for an unknown, suppressed or hypothetical name.

Definition source: English Wiktionary via Wiktextract

Examples

  • The woman known until now as Witness X has been unmasked after a court ruling.
  • Suppose that Mr and Mrs X have been married for many years.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

11

name

Meaning 11

A surname, used by those who have had their identity or heritage, including their proper ancestral names, erased or forgotten.

Definition source: English Wiktionary via Wiktextract

Topics: government, politics

Examples

  • Malcolm X

Meaning relationships

Synonyms: none provided

Antonyms: none provided

12

name

Meaning 12

An online social media network, formerly known as Twitter.

Definition source: English Wiktionary via Wiktextract

Qualifier: social media

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

13

name

Meaning 13

Christ

Definition source: English Wiktionary via Wiktextract

Usage: informal

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

14

name

Meaning 14

The X Window System, a windowing system for bitmap displays commonly used in Unix-like systems.

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: X11

Antonyms: none provided

15

noun

Meaning 15

Any mark that looks like that letter, such as a mark made by a person who cannot read or write in lieu of a signature.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

16

noun

Meaning 16

The spot behind the goal.

Definition source: English Wiktionary via Wiktextract

Topics: ball-games, games, hobbies, lacrosse, lifestyle, sports

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

17

noun

Meaning 17

Ecstasy, a particular street drug.

Definition source: English Wiktionary via Wiktextract

Usage: slang, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

18

noun

Meaning 18

Cross, crossing.

Definition source: English Wiktionary via Wiktextract

Examples

  • Kennington via Charing X

Meaning relationships

Synonyms: none provided

Antonyms: none provided

19

num

Meaning 19

An unknown quantity or unknown value.

Definition source: English Wiktionary via Wiktextract

Examples

  • Let X represent the forecast traffic flow in 20 years’ time.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

20

num

Meaning 20

An unknown or unspecified number of.

Definition source: English Wiktionary via Wiktextract

Usage: humorous, sometimes

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

21

verb

Meaning 21

Alternative spelling of ex (“to delete; to cross out”).

Definition source: English Wiktionary via Wiktextract

Usage: alt-of, alternative

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

22

adjective satellite

Meaning 22

being one more than nine

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: ten, 10

Antonyms: none provided

23

noun

Meaning 23

street names for methylenedioxymethamphetamine

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: Adam, ecstasy, XTC, go, disco biscuit, cristal, hug drug

Antonyms: none provided

Broader terms: methylenedioxymethamphetamine, MDMA

24

noun

Meaning 24

the 24th letter of the Roman alphabet

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: ex

Antonyms: none provided

Broader terms: letter, letter of the alphabet, alphabetic character

25

noun

Meaning 25

the cardinal number that is the sum of nine and one; the base of the decimal system

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: ten, 10, tenner, decade

Antonyms: none provided

Broader terms: large integer

History

Etymology

Introduced by René Descartes in the context of mathematical notation, but has since widened to other contexts.

From Christ by abbreviation, orthographic borrowing from Ancient Greek Χ (Kh, letter chi), from Χριστός (Khristós, “Christ”).

Named after its predecessor, the W Window System; X follows W in the Latin alphabet.

Presumably by abbreviation of the pronunciation of ecstasy.

From cross, due to the X symbol being a cross saltire.

Across languages

Translations

20 source translations are retained for this English entry.

  • Finnish: K — suitable for those over 16 or 18
  • Swedish: barnförbjuden — suitable for those over 16 or 18
  • Chinese Mandarin: 黑叉 (hēichā) — online social media network
  • Finnish: Jesse — informal: Christ
  • Finnish: E — slang: ecstasy
  • Finnish: eve — slang: ecstasy
  • Finnish: essi — slang: ecstasy
  • Finnish: xtc — slang: ecstasy
  • Finnish: risteys — cross, crossing
  • Finnish: suojatie — cross, crossing
  • Arabic: س (sīn) — unknown quantity or unknown value
  • Finnish: X — unknown quantity or unknown value
  • Finnish: tuntematon — unknown quantity or unknown value
  • French: X — unknown quantity or unknown value
  • German: x — unknown quantity or unknown value
  • Macedonian: X — unknown quantity or unknown value
  • Macedonian: икс (iks) — unknown quantity or unknown value
  • Russian: X — unknown quantity or unknown value
  • Russian: икс (iks) — unknown quantity or unknown value
  • Swedish: X — unknown quantity or unknown value