autumnal
From LSJ
πάντα χωρεῖ καὶ οὐδὲν μένει καὶ δὶς ἐς τὸν αὐτὸν ποταμὸν οὐκ ἂν ἐμβαίης → all things move and nothing remains still, and you cannot step twice into the same stream
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Latin > French (Gaffiot 2016)
autumnal, pour autumnale : Varr. d. Char. 118, 25.