/ Dictionary / Index T terminator: Meaning and Definition of Find definitions for: ter•mi•na•tor Pronunciation: (tûr'mu-nā"tur), [key] — n. a person or thing that terminates. the dividing line between the illuminated and the unilluminated part of a satellite or planet, esp. the moon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: terminator (Thesaurus) termination terminatory Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language