Etymology
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uncommon (adj.)

1540s, "not possessed in common," from un- (1) "not" + common (adj.). Meaning "not commonly occurring, unusual, rare" is recorded from 1610s. Related: Uncommonly.

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Definitions of uncommon

uncommon (adj.)
not common or ordinarily encountered; unusually great in amount or remarkable in character or kind;
uncommon birds
he owed his greatest debt to his mother's uncommon character and ability
an uncommon liking for money
frost and floods are uncommon during these months
doing an uncommon amount of business
uncommon (adj.)
marked by an uncommon quality; especially superlative or extreme of its kind; "what is so rare as a day in June"-J.R.Lowell;
an uncommon sense of humor
she was kind to an uncommon degree
Synonyms: rare
From wordnet.princeton.edu