Liddell-Scott-Jones

συνθήκη (sunthēkē) a treaty ^G:N-F

συνθήκη, ἡ,

(συντίθημι) compounding, especially of words and sentences, [Refs 4th c.BC+]: in concrete sense, a compound, [Refs 2nd c.AD+] — but in early writers,

__II convention, compact, σ. καὶ ὁμολογία [Refs 5th c.BC+]; ἐκ συνθήκης by agreement, [συνθήκης 4th c.BC: Aristoteles Philosophus “Analytica Priora” 50a18 ">Refs 5th c.BC+]; κατὰ συνθήκην conventionally, opposed to φύσει, [Refs 4th c.BC+]
__II.2 article of a compact or treaty, τὴν ξ. προφέροντες ἐν ᾗ εἴρητο [Refs 5th c.BC+]: also, treaty, σ. καὶ συμμαχία [Refs 3rd c.BC+]: but in this signification mostly in plural, articles of agreement, and hence, covenant, treaty, between individuals or states, [Refs 5th c.BC+]; γάμων σ. [Refs 1st c.AD+]; σ. κύριαι, ἄκυροι, [Refs 5th c.BC+]; ἐπ᾽ ἄλλους στρατεύειν οὐκ εἶναι ἐν ταῖς σ. [Refs 5th c.BC+]; ξυνθῆκαι Λακεδαιμονίων πρὸς βασιλέα.., σπονδὰς εἶναι καὶ φιλίαν κατὰ τάδε Foed. cited in [Refs 5th c.BC+]; ποιεῖν τινι πρός τινα between them, [Refs 5th c.BC+]; γράψαι, γράφασθαι, [Refs 4th c.BC+]; ἀναιρεῖν, λύειν, [Refs 5th c.BC+]; παρ᾽ οὐδὲν ἡγεῖσθαι Decrees cited in [Refs 5th c.BC+]; ἐκ τῶν σ. according to the covenant, [Refs]; κατὰ τὰς ξ. [Refs 5th c.BC+]; opposed to παρὰ τὰς σ. [Refs]
__III ={θήκη}, coffin, variant in [Refs 4th c.AD+]