verb (used with object), collimated, collimating.
to bring into line; make parallel.
to adjust accurately the line of sight of (a telescope).

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

collimation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
collimate (ˈkɒlɪˌmeɪt)
1.  to adjust the line of sight of (an optical instrument)
2.  to use a collimator on (a beam of radiation or particles)
3.  to make parallel or bring into line
[C17: from New Latin collimāre, erroneously for Latin collīneāre to aim, from com- (intensive) + līneāre, from līnea line]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
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.
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