the act of adding two or more things together; -- opposed to subtraction or diminution.-anything added; increase; augmentation; as, a piazza is an addition to a building.-that part of arithmetic which treats of adding numbers.-a dot at the right side of a note as an indication that its sound is to be lengthened one half.-a title annexed to a man's name, to identify him more precisely; as, john doe, esq.; richard roe, gent.; robert dale, mason; thomas way, of new york; a mark of distinction; a title.-something added to a coat of arms, as a mark of honor; -- opposed to abatement.