/ Dictionary / Index C compaction: Meaning and Definition of Find definitions for: com•pac•tion Pronunciation: (kum-pak'shun, kom-), [key] — n. the act of compacting or the state of being compacted. the consolidation of sediments resulting from the weight of overlying deposits. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: compaction (Thesaurus) compactible compactor Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language