Against the Physicists, Books IX-X of Against the Learned Section 265

πρός τι δὲ τυγχάνειν τὰ κατὰ τὴν ὧς πρὸς ἕτερον σχέσιν νοούμενα, οἶον δεξιὸν ἀριστερόν, ἄνω κάτω, διπλάσιον ἥμισυ· τό τε γὰρ δεξιὸν νοεῖται κατὰ τὴν ὧς πρὸς τὸ ἀριστερὸν σχέσιν καὶ τὸ ἀριστερὸν κατὰ τὴν ὡς πρὸς τὸ δεξιόν, τό τε κάτω κατὰ τὴν ὡς πρὸς τὸ ἄνω καὶ τὸ ἄνω κατὰ τὴν ὡς πρὸς τὸ κάτω· καὶ ἐπὶ τῶν ἄλλων τὸ παραπλήσιον.

Relative things are those conceived according to their relation to another, such as right and left, above and below, double and half. For right is conceived according to its relation to left, and left according to its relation to right; below according to its relation to above, and above according to its relation to below. The same applies to the rest.

Sont relatifs les termes conçus selon leur relation avec un autre, comme droite et gauche, haut et bas, double et moitié. La droite est en effet conçue selon sa relation avec la gauche, et la gauche selon sa relation avec la droite; le bas selon sa relation avec le haut, et le haut selon sa relation avec le bas. Il en va pareillement des autres.