Etymology
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jillion (n.)

by 1939, arbitrary coinage, modeled on million, etc. Compare zillion, gazillion.

updated on August 04, 2018

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Definitions of jillion from WordNet

jillion (n.)
a very large indefinite number (usually hyperbole);
Synonyms: million / billion / trillion / zillion / gazillion / bazillion
From wordnet.princeton.edu, not affiliated with etymonline.