/ Dictionary / Index A autocollimator: Meaning and Definition of Find definitions for: au•to•col•li•ma•tor Pronunciation: (ô"tō-kol'u-mā"tur), [key] — n. Optics. an instrument combining the functions of a telescope and collimator, for detecting and measuring very small deviations in a beam of light. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. autocollimation autocorrelation 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