Source : Webster's Revised Unabridged Dictionary (1913)

Coopt \Co*["o]pt"\, v. t. [See {Co["o]ptate}. Cf. F. coopter.]
   To choose or elect in concert with another. [R.]

         Each of the hundred was to co["o]pt three others.
                                                  --Jowett
                                                  (Thysyd. ).