n. aligning lenses along line of sight to minimize aberrations
the GNU version of the Collaborative International Dictionary of English
n. 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.
The Century Dictionary and Cyclopedia
n. The accurate adjustment of the line of sight of a telescope.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the accurate adjustment of the line of sight of a telescope
Word Usage
"Exposure to ionizing radiation during a medical examination can be limited by lead shielding, tube collimation and using the lowest dose necessary to obtain a diagnostic image."