ἀντάρχων
From LSJ
Ὁ δὲ μὴ δυνάμενος κοινωνεῖν ἢ μηδὲν δεόμενος δι' αὐτάρκειαν οὐθὲν μέρος πόλεως, ὥστε ἢ θηρίον ἢ θεός → Whoever is incapable of associating, or has no need to because of self-sufficiency, is no part of a state; so he is either a beast or a god
English (LSJ)
οντος, ὁ, A vice-president, τοῦ ἀγῶνος IG22.1077, cf. ib.12 (2).35e (Mytil.); pro-magistrate, SIG785.17 (Chios), POxy.907.21 (iii A. D.); ἀ. τῶν στρατηγῶν AJA18.329 (Sardes, i B.C.).
Spanish (DGE)
-οντος, ὁ
1 vicepresidente τοῦ ἱεροτάτου ἀγῶνος IG 22.1077.13, cf. 12(2).35e (Mitilene).
2 suplente o vice de un magistrado ἄρχων ἢ ἀντάρχων SIG 785.17 (Quíos), POxy.907.21 (III d.C.), SEG 3.378
•lugarteniente τῶν στρατηγῶν Sardis 8.133 (I a.C.).