The present participle of collimate; the ongoing process of aligning or bringing into parallel arrangement, especially in optics.
From 'collimate' plus the present participle suffix -ing.
In quantum optics labs, 'collimating' single photons is one of the hardest problems—making individual particles of light travel in parallel is so difficult it's actually used in quantum cryptography!
Complete word intelligence in one call. Free tier — 50 lookups/day.