/ Dictionary / Index O on-site: Meaning and Definition of Find definitions for: on-site Pronunciation: (on'sīt", ôn'-), [key] — adj. accomplished or located at the site of a particular activity or concern: on-site medical treatment for accident victims. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: on-site (Thesaurus) onside kick onslaught Related Content Daily Word Quiz: reclusive Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language