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Related to supplemental: Supplemental Security Income
adj. referring to anything that is added to complete something, particularly a document such as a supplemental declaration, supplemental complaint, supplemental answer, supplemental claim.
supplementaladjective accompanying, additional, additive, adjunct, adventitious, ancillary, appurtenant, attendant, augmentative, auxiliary, collateral, concomitant, contributory, extra, extrinsic, incidental, nonessential, spare, submitted at a later time, subordinate, superfluous, supernumerary, supervenient, unessential, unnecessary
Associated concepts: supplemental affidavit, supplemental answer, supplemental claim, supplemental complaint, supplemental condition, supplemental findings, supplemental insurance, supplemental policy, supplemental procedure, supplemental questions
See also: accompanying, additional, ancillary, collateral, expendable, extrinsic, incidental, nonessential, pendent, subsidiary, superfluous, supplementary, unnecessary
SUPPLEMENTAL. That which is added to a thing to complete it as a supplemental affidavit, which is an additional affidavit to make out a case; a supplemental bill. (q.v.)