late 14c., nicete, "folly, stupidity," a sense now obsolete, from Old French niceté "foolishness, childishness, simplicity," from nice "silly" (see nice). It underwent a sense evolution parallel to that of nice, arriving at "minute, subtle point" 1580s and "exactitude, accuracy" in 1650s. Phrase to a nicety "exactly, with great exactness" is attested from 1795.
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