cooptatio
From LSJ
αὐτὸν κέκρουκας τὸν βατῆρα τοῦ λόγου → you have struck the very threshold of the argument, you have struck the most important and chiefmost point
Latin > English (Lewis & Short)
cŏoptātĭo: ōnis, f. co-opto,
I an election, choice: collegiorum, Cic. Lael. 25, 96: censoria, id. Leg. 3, 12, 27: in Patres, i. e. a confirmation by the Senate of Senators nominated by the king, Liv. 4, 4, 7 Weissenb. ad loc.; Flor. 4, 4.
