adj. & n.
adj. 1 involving separation; disjoining. 2 Gram. (esp. of a conjunction) expressing a choice between two words etc., e.g. or in asked if he was going or staying (cf. COPULATIVE). 3 Logic (of a proposition) expressing alternatives.
n. 1 Gram. a disjunctive conjunction or other word. 2 Logic a disjunctive proposition. disjunctively adv.
[ ME f. L disjunctivus (as DISJOIN) ]