I. noun 1. (also altazimuth mount or mounting) —
[Astronomy] a telescope mounting that moves in azimuth (about a vertical axis) and in altitude (about a horizontal axis).Compare with equatorial mount.
2. (also altazimuth telescope) — a telescope on an altazimuth mounting. 3. a surveying instrument for measuring vertical and horizontal angles, resembling a theodolite but larger and more precise.
– origin mid 19th cent.: blend of altitude and azimuth.