Breadcrumb Home > Dictionary > Index I increaser: Meaning and Definition of Find definitions for: in•creas•er Pronunciation: (in-krē'sur), [key] — n. a person or thing that increases. (in plumbing) a coupling increasing in diameter at one end. Cf. reducer (def. 3). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. increase increasing ✖ Related Content Daily Word Quiz: hortatory Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language