Definition of -acy in English:

-acy

suffix

Forming nouns of state or quality: celibacy lunacy

Origin

variant of -cy, from Latin -atia (medieval Latin -acia), or from Greek -ateia.

Definition of -acy in:

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Word of the day vituperate
Pronunciation: vɪˈtjuːpəreɪt
verb
blame or insult (someone) in strong language...