Disjunctive

a. [ L. disjunctivus: cf. F. disjonctif. ] 1. Tending to disjoin; separating; disjoining. [ 1913 Webster ]

2. (Mus.) Pertaining to disjunct tetrachords. “Disjunctive notes.” Moore (Encyc. of Music). [ 1913 Webster ]

Disjunctive conjunction (Gram.), one connecting grammatically two words or clauses, expressing at the same time an opposition or separation inherent in the notions or thoughts; as, either, or, neither, nor, but, although, except, lest, etc. --
Disjunctive proposition, a proposition in which the parts are connected by disjunctive conjunctions, specifying that one of two or more propositions may hold, but that no two propositions may hold at the same time; as it is either day or night. --
Disjunctive syllogism (Logic), one in which the major proposition is disjunctive; as, the earth moves in a circle or an ellipse; but in does not move in a circle, therefore it moves in an ellipse. [ 1913 Webster ]