The Collaborative International Dictionary of English v.0.48:

Conjugate \Con"ju*gate\, v. t. [imp. & p. p. Conjugated; p.
   pr. & vb. n. Conjugating.]
   1. To unite in marriage; to join. [Obs.] --Sir H. Wotton.
      [1913 Webster]

   2. (Gram.) To inflect (a verb), or give in order the forms
      which it assumes in its several voices, moods, tenses,
      numbers, and persons.
      [1913 Webster]