[roh-tey-shuh n in-vur-zhuh n, -shuh n] /roʊˈteɪ ʃən ɪnˈvɜr ʒən, -ʃən/
an axis of a crystal such that rotating about the axis and then inverting the crystal brings the crystal back to its original position.
noun, Crystallography. 1. rotation axis. rotation axis noun, Crystallography. 1. an imaginary line through a crystal about which the crystal may be rotated a specified number of degrees and be brought back to its original position.
noun, Crystallography. 1. any of four points, lines, or planes of a crystal: a center of symmetry, a reflection plane, a rotation axis, or a rotation-inversion axis.
noun, Crystallography. 1. reflection plane.
noun 1. John Addington [ad-ing-tuh n] /ˈæd ɪŋ tən/ (Show IPA), 1840–93, English poet, essayist, and critic. noun 1. John Addington (ˈædɪŋtən). 1840–93, English writer, noted for his Renaissance in Italy (1875–86) and for studies of homosexuality