ADDITION n.
Something added to a coat of arms, as a mark of honor; -- opposed to abatement. Vector addition (Geom.), that kind of addition of two lines, or vectors, AB and BC, by which their sum is regarded as the line, or vector, AC.
ADVANCE a.
; -- used for advanced; as, an advance guard, or that before the main guard or body of an army; advance payment, or that made before it is due; advance proofs, advance sheets, pages of a forthcoming volume, received in advance of the time of publication.