A.choose and associate with, “τινάς τινι ξυμβούλους” Th.5.63; ἑωυτῷ π. τινά take for one's companion or ally, Hdt.9.10; κοινὸν αὑτοῖς [διαιτητήν] D.59.45; “σφίσιν αὐτοῖς ἄρχοντας” Arist.Ath. 35.1; “ὁ αἰσυμνήτης τοὺς προσεταίρους -εῖται” SIG57.7 (Milet., v B. C.), cf. IG12.56.27, 84.38.
III. Act. προσαιρεῖν appoint as one's assistant, POxy.58.17 (iii A.D.): aor. part. προσελών dub. sens. in PPetr.2.20 iii 9 (cf. 3p.76, iii B.C.).