- Adjective. forming an adjunct.
- Adjective. additional; neither basic nor primary: "adjunctive therapy".
- Adjective. (logic) the property of two operations x and y, such that ax(ayb) = a, and ay(axb) = a.
- Noun. (grammar) a connector joining two components of the same weight, such as a coordinating conjunction.
- Noun. (context, manufacturing) a substance added as a supplement; often in the phrase "additives and adjunctives.".