Each of the hundred was to coopt three others. Jowett (Thucyd.). [ 1913 Webster ]
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 ]
The first election and cooptation of a friend. Howell. [ 1913 Webster ]