The Collaborative International Dictionary of English v.0.48:

Recognizable \Rec"og*ni`za*ble\ (r[e^]k"[o^]g*n[imac]`z[.a]*b'l
   or r[-e]*k[o^]g"n[i^]*z[.a]*b'l; 277), a.
   Capable of being recognized. [Written also recognisable.]
   -- Rec"og*ni`za*bly, adv.
   [1913 Webster]

WordNet (r) 3.0 (2006):

recognisable
    adj 1: capable of being recognized [syn: recognizable,
           recognisable, placeable]