The Collaborative International Dictionary of English v.0.48:

Anglicism \An"gli*cism\, n. [Cf. F. anglicisme.]
   1. An English idiom; a phrase or form language peculiar to
      the English. --Dryden.
      [1913 Webster]

   2. The quality of being English; an English characteristic,
      custom, or method.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Anglicism
    n 1: an expression that is used in Great Britain (especially as
         contrasted with American English) [syn: Anglicism,
         Briticism, Britishism]
    2: a custom that is peculiar to England or its citizens [syn:
       Anglicism, Britishism]