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The Collaborative International Dictionary
efficacity

efficacity \ef`fi*cac"i*ty\, n. [L. efficacitas: cf. F. efficacit['e].] Efficacy. [R.]
--J. Fryth.

Wiktionary
efficacity

n. efficacy.

Usage examples of "efficacity".

This new and more complicated patterning presents general grammar with a necessary choice: either to pursue its analysis at a lower level than nominal unity, and to bring into prominence, before signification, the insignificant elements of which it is constructed, or to reduce that nominal unity by means of a regressive process, to recognize its existence within more restricted units, and to find its efficacity as representation below the level of whole words, in particles, in syllables, and even in single letters themselves.

It was some years since Stephen had heard Jack reprove one of his officers, and he was much struck by the remarkable advance in efficacity, by the impersonal, God-like, severe authority that could not possibly be feigned or assumed by any man who did not naturally possess it.

We know how Classical analysis had been brought to the point of suspending the privileged position of the most important organs in order to concentrate attention on their taxonomic efficacity.