conventional
From LSJ
τοῦ δὲ πολέμου οἱ καιροὶ οὐ μενετοί → in war, opportunities won't wait | the chances of war will not wait (Thucydides 1.142.2)
English > Greek (Woodhouse)
adjective
customary: P. and V. συνήθης, νόμιμος.
does this theory please you better, that names are merely conventional symbols: P. ἢ ὅδε μᾶλλον ἀρέσκει ὁ τρόπος… τὸ συνθήματα εἶναι τὰ ὀνόματα (Plato, orat. 433E).