·noun That part of arithmetic which treats of adding numbers.
II. Addition ·noun Something added to a coat of arms, as a mark of honor;
— opposed to abatement.
III. Addition ·noun Anything added; increase; augmentation; as, a piazza is an addition to a building.
IV. Addition ·noun The act of adding two or more things together;
— opposed to subtraction or diminution.
V. Addition ·noun A dot at the right side of a note as an indication that its sound is to be lengthened one half.
VI. Addition ·noun 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.