alternative  expression.Patents.  In  a  patent  claim,  a  recitation  of  two  or  more  elements  or

limitations that  perform  the  same  function  <iron,  steel,  or  other  magnetic  material>.  • Although

once  contrary  to  U.S.  Patent  and  Trade-mark  Office  policy,  alternative  expressions  are  now

permitted if they present no uncertainty or ambiguity about the scope or clarity of the claims. —

Also termed alternative language. [Cases: Patents    101(5).] [Blacks Law 8th]