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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Borrowed from French trillion, from French tri- (“three”) + -illion, equivalent to tri- + -illion. The noun was coined by American basketball player Harvey Pollack, because of the way the numbers read across a basketball box score.
million, billion, zillion, jillion, gazillion
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Classic usage
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