[ad. med.L. altimetria, f. L. alti- high + Gr. -μετρία measuring: see -METRY. Cf. Fr. altimétrie.] ‘The art of taking or measuring heights, whether accessible or inaccessible, generally performed by a quadrant.’ J.
1696. Phillips, Altimetry, the first part of Geometrical Practise, which reaches the measuring of Lines. Ibid. (1706), Altimetry, that part of Geometry, which teaches the Method of taking and measuring of Heights.
1778. B. Donn (title), An Essay on the Elements of Plane Trigonometry with their application to Altimetry and Longimetry.
1815. Encycl. Brit., I. 750. Altimetry, the art of measuring altitudes, or heights.
