The Collaborative International Dictionary of English v.0.48:

familiarise \familiarise\ v. t.
   to make familiar or acquainted; same as familiarize.
   [chiefly Brit.]

   Syn: familiarize, acquaint.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

familiarise
    v 1: make familiar or conversant with; "you should acquaint
         yourself with your new computer"; "We familiarized
         ourselves with the new surroundings" [syn: familiarize,
         familiarise, acquaint]