Definition of -acy 

: state : quality accuracy adequacy replacing final -ate of the base adjective

History and Etymology for -acy

Middle English -acie, borrowed from Anglo-French, borrowed from Medieval Latin -ācia, -ātia, going back to Late Latin, from Latin -ātus -ate entry 2, -ate entry 3 + -ia -y entry 2

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to make faulty or ineffective

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