/ Dictionary / Index K km: Meaning and Definition of Find definitions for: km Pronunciation: [key] kilometer; kilometers. km. Pronunciation: [key] kilometer; kilometers. kingdom. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: km (Thesaurus) Klystron kMc 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