[bril-yuh n-see]
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Origin of brilliancy

First recorded in 1740–50; brilli(ant) + -ancy
Related formso·ver·bril·lian·cy, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for brilliancy

Historical Examples of brilliancy

Word Origin and History for brilliancy

1747; see brilliant + -cy. Also cf. brilliance.

Online Etymology Dictionary, © 2010 Douglas Harper