προσήκων
From LSJ
προγράψαντες οὖν τά τε θεωρήματα καὶ τὰ ἐπιτάγματα τὰ χρεῖαν ἔχοντα εἰς τὰς ἀποδείξιας αὐτῶν μετὰ ταῦτα γραψοῦμές τοι τὰ προκείμενα → having therefore written at the beginning the theorems and the postulates that are necessary for their proofs, we will then write out for you the propositions
Russian (Dvoretsky)
προσήκων: ουσα, ον part. к προσήκω.
English (Woodhouse)
(see also: προσήκω) appropriate, becoming, befitting, fit, fitting, kindred, proper, suitable, by marriage, connected with, related by blood