/ Dictionary / Index P predation pressure: Meaning and Definition of Find definitions for: preda'tion pres"sure Pronunciation: [key] — Ecol. Ecol. the effect of predation upon a population, resulting in the decrease in size of that population. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. predation predatism Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language