Definition of: collimate

(kol′ə·māt) v.t. ·mat·ed, ·mat·ing
1. To bring into line.
2. To adjust the line of sight of, as of a telescope or other optical instrument.
3. To make parallel, as refracted rays of light or a gunsight with the axis of the gun's barrel. [<L collimatus, alter. of collineatus, pp. of collineare <com- together + lineare align]
—col′li·ma′tion noun