συνέπαινος
From LSJ
κρατίστην εἶναι δημοκρατίαν τὴν μήτε πλουσίους ἄγαν μήτε πένητας ἔχουσαν πολίτας → the best democracy is that in which the citizens are neither very rich nor very poor (Thales/Plutarch)
English (LSJ)
ον,
A joining in approbation of a thing, σ. εἶναι or γίνεσθαι give one's consent to a thing, τινι Hdt.3.119, 5.31: abs., ib.20, Nic.Dam.Fr.130.18 J.: c. acc. et inf., consent that . ., Hdt.7.15: c. dat. pers., D.C.57.15.