convention
From LSJ
Οὕτως γὰρ ἠγάπησεν ὁ Θεὸς τὸν κόσμον, ὥστε τὸν Υἱὸν τὸν μονογενῆ ἔδωκεν, ἵνα πᾶς ὁ πιστεύων εἰς Αὐτὸν μὴ ἀπόληται ἀλλ᾽ ἔχῃ ζωὴν αἰώνιον → For God so loved the world that he gave his only begotten Son that whosoever believeth in him should not perish but have everlasting life (John 3:16)
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).
