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gillion

(slang, hyperbole) An unspecified large number (of).

ˈɡɪljənCurrent171 viewsLast reviewed Jun 29, 2026+ Add a definition
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Definitions

UK
#1·Apr 27, 2026UK

(slang, hyperbole) An unspecified large number (of).

For parents

Gillion means: An unspecified large number (of).. It is informal slang, fine in casual speech but not suited to formal contexts. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.

For ESL learners

gillion means: An unspecified large number (of).. Register: very informal, slang. Suitable only for casual conversation, chat and social media. Do not use in business, academic or news writing. A common learner mistake is using the word in a register it does not fit, or assuming a single global meaning; native speakers immediately notice when slang appears in formal contexts, so always check the surrounding register before producing it yourself.

Cluster: general
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UK
#2·Apr 27, 2026UK

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

Origin: From . Modelled after million, billion etc. Compare also jillion. Origin information sourced from Wiktionary contributors (CC BY-SA 4.0).
For parents

Gillion means: A thousand million, proposed as an alternative to the (now little used) British milliard and the (ambiguous, in the UK) US billion.. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.

For ESL learners

gillion means: A thousand million, proposed as an alternative to the (now little used) British milliard and the (ambiguous, in the UK) US billion.. Register: neutral, standard English. A common learner mistake is using the word in a register it does not fit, or assuming a single global meaning; native speakers immediately notice when slang appears in formal contexts, so always check the surrounding register before producing it yourself.

Heard in the wild
  • “I for one, am not granularly following the fluctuating cost of a dick measuring monument of a senile old con-man. It’s elenevty gillion of your tax dollars now—isn’t that shocking? In no fucking way is it”

    — Bluesky· May 2026
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For specific readers

Gillion means: An unspecified large number (of).. It is informal slang, fine in casual speech but not suited to formal contexts. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.

Why is this section here?

Slang is read by different audiences for very different reasons. The For parents view re-explains the term in plain, non-judgemental language so a caregiver can understand what their child means without needing the surrounding subculture. The For English learners view focuses on register (when it's safe to use), formal alternatives, and common mistakes — what a textbook won't teach you.

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