automorphism - Mathematics. 1. an isomorphism from an algebraic structure to itself.an isomorphism from an algebraic structure to itself. 2. an isomorphism from a graph to itself.an isomorphism from a graph to ; дс тдрлими цюлютдажкию дроемжки аиакиохдйис лидр http://www.harcourt.com/dictionary/def/9/3/9/5/939500.html;