ἀντιπολιτεία
From LSJ
Μεγάλοι δὲ λόγοι μεγάλας πληγὰς τῶν ὑπεραύχων ἀποτίσαντες γήρᾳ τὸ φρονεῖν ἐδίδαξαν → The great words of the arrogant pay the penalty by suffering great blows, and teach one to reason in old age
English (LSJ)
ἡ,
A political opposition, τινὶ πρός τινα Plb.20.5.5, cf. Plu.Caes.11. II in pl., opposite parties, Plb.11.25.5.