Unicity is valid Scrabble Word

Is unicity a scrabble word?
Official Scrabble Players Dictionary NO
Official Tournament and Club Word List NO
Collins Scrabble Words YES
Is unicity valid Words with Friends?
Words with Friends YES

Definitions for UNICITY in dictionary:

Words related to UNICITY

oneness7 unicities11
Find what other words can be done using letters: "unicity"
https://scrabble-word.com/finder/unicity
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