/ Dictionary / Index P proficiency: Meaning and Definition of Find definitions for: pro•fi•cien•cy Pronunciation: (pru-fish'un-sē), [key] — n. the state of being proficient; skill; expertness: proficiency in music. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: proficiency (Thesaurus) proffer proficiency badge Related Content Daily Word Quiz: blanch Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language