/ Dictionary / Index P preprocessor: Meaning and Definition of Find definitions for: pre•proc•es•sor Pronunciation: (prē'pros"es-ur, -u-sur or, esp. Brit., -prō"ses-ur, -su-sur), [key] — n. Computers. a program that performs some type of processing, as organization of data or preliminary computation, in advance of another program that will perform most of the processing. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. preprint preproduction Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language