οὐ τῷ πλήθει ἀλλὰ τῷ ἀξιώματι → not in numbers but in quality
P. and V. κοινωνία, ἡ.
partnership in: P. and V. κοινωνία, ἡ (gen.), Ar. and P. μετουσία, ἡ (gen.).