An Etymological Dictionary of Astronomy and Astrophysics

1a) A → discussion, as of a public question in an assembly, involving opposing viewpoints.

1b) A formal contest in which the affirmative and negative sides of a proposition are advocated by opposing speakers.

2. To engage in argument or discussion, as in a legislative or public assembly (Dictionary.com).

Etymology (EN): M.E. debaten, from O.Fr. debatre, literally “to fight,” from → de- “down, completely,” + batre “to beat,” → beat.

Etymology (PE): Vâzat, from vâ-, → de-, + zat- (Baluci žat-) variant of zad-, zadan “to strike, beat”, → beat.