Note 3 — Chapter V · ANALYTICA PRIORA I.
Reading edition
Aristot. Analyt. Prior. I. i. p. 24, b. 16: ὅρον δὲ καλῶ εἰς ὃν διαλύεται ἡ πρότασις, οἷον τό τε κατηγορούμενον καὶ τὸ καθ’ οὗ κατηγορεῖται, &c.
Ὅρος — Terminus — seems to have been a technical word first employed by Aristotle himself to designate subject and predicate as the extremes of a proposition, which latter he conceives as the interval between the termini — διάστημα. (Analyt. Prior. I. xv. p. 35, a. 12. στερητικῶν διαστημάτων, &c. See Alexander, Schol. pp. 145-146.)
In the Topica Aristotle employs ὅρος in a very different sense — λόγος ὁ τὸ τί ἦν εἶναι σημαίνων (Topic. I. v. p. 101, b. 39) — hardly distinguished from ὁρισμός. The Scholia take little notice of this remarkable variation of meaning, as between two treatises of the Organon so intimately connected (pp. 256-257, Br.).