/ Dictionary / Index P pumping: Meaning and Definition of Find definitions for: pump•ing Pronunciation: (pum'ping), [key] — n. the act or process of pumping or the action of a pump. rapid change in the height of the column in a mercury barometer, resulting from fluctuations in the surrounding air pressure. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pumping (Thesaurus) pump gun pumpkin Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language