/ Dictionary / Index C collinear: Meaning and Definition of Find definitions for: col•lin•e•ar Pronunciation: (ku-lin'ē-ur, kō-), [key] — adj. lying in the same straight line. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: collinear (Thesaurus) collimator Collingswood Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language