collimating

/K AA1 L IH0 M EY0 T IH0 NG/
verb
  1. 1

    To focus into a narrow beam or column; to adjust a focusing device so that it produces a narrow beam.

    โ€œI need to collimate my telescope so that the images are clearer.โ€

adjective
  1. 1

    That collimates, or employs collimation

Source: https://en.wiktionary.org/wiki/collimate, https://en.wiktionary.org/wiki/collimating