πρόλογος

A. prologue of a play, i.e. the part before the entry of the chorus, Arist. Po. 1452b19; esp. (as in E.) monologue containing a narrative of facts introductory to the main action, Ar. Ra. 1119, etc., cf. Arist. Rh. 1414b20.

2. one who speaks the prologue, Luc. Pseudol. 4.

3. introduction in a speech, Lib. Or. 1.55(pl.), al.

II. Arith., antecedent, in ratios in which the first number is the largest, as 5:3, Nicom. Ar. 1.19, Theol.Ar. 13, Dam. Pr. 374; cf. ὑπόλογος.