Source : Webster's Revised Unabridged Dictionary (1913)

Prevenient \Pre*ven"i*ent\, a. [L. praeveniens, p. pr.]
   Going before; preceding; hence, preventive. ``Prevenient
   grace descending.'' --Milton.

Source : WordNet®

prevenient
     adj : in anticipation [syn: {anticipatory}]