τὸν τεθνηκότα μὴ κακολογεῖν → do not speak ill of the dead, speak no ill of the dead (Chilon the Spartan)
assembly: P. and V. σύλλογος, ὁ, σύνοδος, ἡ.
for a religious object; P. and V. πανήγυρις. ἡ.
agreement: P. and V. σύμβασις, ἡ, συνθῆκαι, αἱ, σύνθημα, τό, P. ὁμολογία, ἡ.
as opposed to nature: P. συνθήκη, ἡ, νόμος, ὁ (Plato, Gorgias 483A).