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[kol-uh-meyt] /ˈkɒl əˌmeɪt/
verb (used with object), collimated, collimating.
to bring into line; make parallel.
to adjust accurately the line of sight of (a telescope).
Origin of collimate
1615-25; < Latin collimātus, misreading of collineātus, past participle of collineāre to direct in a straight line, equivalent to col- col-1 + -lineā-, verbal derivative of linea line1 + -tus past participle suffix
Related forms
collimation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for collimate
  • It attempts to collimate the light that is sent out by a light bulb in all directions.
  • collimate the fluoroscopic beam to the size of the aluminum block.
British Dictionary definitions for collimate


verb (transitive)
to adjust the line of sight of (an optical instrument)
to use a collimator on (a beam of radiation or particles)
to make parallel or bring into line
Derived Forms
collimation, noun
Word Origin
C17: from New Latin collimāre, erroneously for Latin collīneāre to aim, from com- (intensive) + līneāre, from līnea line
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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