Webster's Online Dictionary
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Definition: EFFICACITY

Part of Speech Definition
Noun 1. Efficacy.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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"Efficacity" is a common misspelling or typo for: efficacy.

Date "Efficacity" was first used in popular English literature: sometime before 1801. (references)

Definition: EFFICACITY

Part of SpeechDefinition
Noun1. Efficacy.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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"EFFICACITY" is a common misspelling or typo for: efficacy.

Date "EFFICACITY" was first used in popular English literature: sometime before 1801. (references)