Gillion
noun, num, slang ·Moderate ·College level
Definitions
- 1 An unspecified large number (of). excessive, slang
"At Guy's school there had been an outdoor pool, in use from April to October, a watery grave for a billion insects, or quite possibly a gillion or a squillion. The bright turquoise lining had wrinkled under the children's feet."
- 1 A thousand million, proposed as an alternative to the (now little used) British milliard and the (ambiguous, in the UK) US billion. British, rare
"The internationally agreed symbol for 10^6 is M and this is the initial letter of million. Would it not be logical and convenient to turn this happy accident into a principle and use G, the internationally agreed symbol for 10^9, as the initial letter of the word for 1,000,000,000? That number would thus be called a gillion. Whether the g should be hard or soft is a matter of opinion. I incline to hard because of the derivation from giga."
Example
More examples"The internationally agreed symbol for 10^6 is M and this is the initial letter of million. Would it not be logical and convenient to turn this happy accident into a principle and use G, the internationally agreed symbol for 10^9, as the initial letter of the word for 1,000,000,000? That number would thus be called a gillion. Whether the g should be hard or soft is a matter of opinion. I incline to hard because of the derivation from giga."
Etymology
From gi(ga)- + -illion. Modelled after million, billion etc. Compare also jillion.
More for "gillion"
Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.