συνθήκη · synthēkē — LSJ
compounding, esp. of words and sentences, Luc. Hist.Conscr. 46, Hermog. Id. 1.1, 3, Philostr. VS 1.17.4, Herm. in Phdr. p.175 A.: in concrete sense, a compound, Luc. Prom.Es 5:— but in early writers,
convention, compact, σ. καὶ ὁμολογία Pl. Cra. 384d, cf. 433e; ὁ νόμος σ. καὶ ἐγγυητὴς ἀλλήλοις τῶν δικαίων Arist. Pol. 1280b10, cf. Rh. 1376a33; ἐκ συνθήκης by agreement, Pl. Lg. 879a; διὰ συνθήκης Arist. APr. 50a18; κατὰ συνθήκην conventionally, opp. φύσει, Id. EN 1133a29; so συνθήκῃ ib. 1134b32: pl., συνθήκας ποιεῖσθαι τὰς ὑπὲρ τοῦ μὴ βλάπτειν ἄλληλα Epicur. Sent. 32.
article of a compact or treaty, τὴν ξ. προφέροντες ἐν ᾗ εἴρητο Th. 5.31, cf. 1.78: also, treaty, σ. καὶ συμμαχία SIG 421.1 (Thermon, iii B.C.): but in this signf. mostly in pl., articles of agreement, and hence, covenant, treaty, between individuals or states, A. Ch. 555, Ar. Lys. 1267, Isoc. 4.176, etc.; συνθῆκαι περὶ εἰρήνης X. Mem. 4.4.17; γάμων σ. Plu. Luc. 18; σ. κύριαι, ἄκυροι, Lys. 18.15; ἐπʼ ἄλλους στρατεύειν οὐκ εἶναι ἐν ταῖς σ. X. HG 7.5.4, cf. SIG 135.1 (Olynthus, iv B.C.), al.; ξυνθῆ
= θήκη, coffin, v.l. in Lib. Or. 8.11.