/ Dictionary / Index P progressive assimilation: Meaning and Definition of Find definitions for: progres'sive assimila'tion Pronunciation: [key] — Phonet. Phonet. assimilation in which a preceding sound has an effect on a following one, as in shortening captain to cap'm rather than cap'n. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. progressive Progressive Conservative Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language