The Collaborative International Dictionary of English v.0.48:

Juxtapose \Jux`ta*pose"\ (j[u^]ks`t[.a]*p[=o]z"), v. t. [Cf.
   Juxtaposit, Pose.]
   To place in juxtaposition. --Huxley.
   [1913 Webster]

WordNet (r) 3.0 (2006):

juxtapose
    v 1: place side by side; "The fauvists juxtaposed strong colors"