Entry 2 senses · 2 variants Webster, 1913 Adjunctive · Ad·junc·tive · IPA a. n. 01 a. Joining; having the quality of joining; forming an adjunct. 1. Joining; having the quality of joining; forming an adjunct. 02 n. One who, or that which, is joined. 1. One who, or that which, is joined.