English dictionary
collimation
Definitions, examples, synonyms and antonyms from WordNet 3.0.
noun
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the accurate adjustment of the line of sight of a telescope
Source: WordNet 3.0
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The act of collimating; the adjustment of the line of the sights, as the axial line of the telescope of an instrument, into its proper position relative to the other parts of the instrument.
Source: webster1913