The Collaborative International Dictionary of English v.0.48:

Anticipatory \An*tic"i*pa*to*ry\
   ([a^]n`t[i^]s"[i^]*p[.a]*t[-o]*r[y^]), a.
   Forecasting; of the nature of anticipation. --Owen.
   [1913 Webster]

         Here is an anticipatory glance of what was to be. --J.
                                                  C. Shairp.
   [1913 Webster]

WordNet (r) 3.0 (2006):

anticipatory
    adj 1: in anticipation [syn: anticipatory, prevenient]