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Dictionary

ef•fi•ca•cious

Pronunciation: (ef"i-kā'shus), [key]
—adj.
capable of having the desired result or effect; effective as a means, measure, remedy, etc.: The medicine is efficacious in stopping a cough.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

effete

efficacity

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