/ Dictionary / Index S sedimentation: Meaning and Definition of Find definitions for: sed•i•men•ta•tion Pronunciation: (sed"u-mun-tā'shun), [key] — n. the deposition or accumulation of sediment. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sedimentation (Thesaurus) sedimentary sedimentology Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language