adjunctive adjective 4noun 2forms 1 adjective4 •Additional; neither basic nor primary. •Forming an adjunct. •Forming a noun adjunct. •The property of two operations x and y, such that ax(ayb) = a, and ay(axb) = a. noun2 •A substance added as a supplement; often in the phrase "additives and adjunctives.". •A connector joining two components of the same weight, such as a coordinating conjunction. formsadjunctives