Etymology
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zillion (n.)

1942, arbitrary coinage with no definite numerical value; first recorded in Billboard magazine. Compare jillion, gazillion.

updated on August 17, 2020

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Definitions of zillion from WordNet
1
zillion (n.)
a very large indefinite number (usually hyperbole);
Synonyms: million / billion / trillion / jillion / gazillion / bazillion
2
zillion (adj.)
very large indeterminate number;
a zillion people were there
From wordnet.princeton.edu, not affiliated with etymonline.

Dictionary entries near zillion

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zing