/ Dictionary / Index F functional calculus: Meaning and Definition of Find definitions for: func'tional cal'culus Pronunciation: [key] the branch of symbolic logic that includes the sentential calculus and that deals with sentential functions and quantifiers and with logical relations between sentences containing quantifiers. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. functional analysis functional change Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language