adjective

1. disjoining; separating or causing to separate
2. having to do with disjunction
3. Gram. indicating a contrast or an alternative between words, clauses, etc. in “John or Bob may go, but their sister may not,” “or” and “but” are disjunctive conjunctions
4. Logic designating or including a compound proposition consisting of two alternatives joined by or

Etymology: ME disjunctif < L disjunctivus

noun