Standard Lemma guide

gillion

noun · num · 2 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

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  • gĭl'yən
  • jĭl'yən
  • /ˈɡɪljən/
  • /ˈd͡ʒɪljən/
  • homophone: jillion
  • homophone: Gillian
  • homophone: Jillian stripped-by-parse_pron_post_template_fn
  • rhymes with -ɪljən

1

noun

Meaning 1

An unspecified large number (of).

Definition source: English Wiktionary via Wiktextract

Usage: excessive, slang

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

num

Meaning 2

A thousand million, proposed as an alternative to the (now little used) British milliard and the (ambiguous, in the UK) US billion.

Definition source: English Wiktionary via Wiktextract

Usage: UK, rare

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

From gi(ga)- + -illion. Modelled after million, billion etc. Compare also jillion.