(a.) Coming as something additional or extraneous; coming afterwards.
Thesaurus Entries
accessory, accidental, additional, adscititious, adventitious, appurtenant, ascititious, auxiliary, casual, circumstantial, collateral, contingent, extra, fortuitous, incidental, inessential, nonessential, secondary, subsidiary, superadded, superfluous, supplemental, supplementary, unessential
