/ Dictionary / Index P preform: Meaning and Definition of Find definitions for: pre•form Pronunciation: (v.prē'fôrm'n.prē'fôrm&sec), [key] — v.t. to form beforehand. to determine or decide beforehand: to preform an opinion. to shape or fashion beforehand: to preform a mold. —n. biscuit (def. 5). any of various uncompleted objects of manufacture after preliminary shaping. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: preform (Thesaurus) preflight preformation Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language