cooptate

from The Collaborative International Dictionary of English v.0.48

Cooptate \Co*["o]p"tate\, v. t. [L. cooptatus, p. p. of cootare
   to elect to something; co- + optare to choose.]
   To choose; to elect; to coopt. [Obs.] --Cockeram.
   [1913 Webster] co-optation