ἐμπλήρωμα
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)
-ατος, τό, space filled up, dub. l. in Gal.18(1).376.
Spanish (DGE)
-ματος, τό complemento, añadido Gal.18(1).376 (dud.).