addition

n. [ F. addition, L. additio, fr. addere to add. ] 1. The act of adding two or more things together; -- opposed to subtraction or diminution. “This endless addition or addibility of numbers.” Locke. [ 1913 Webster ]

2. Anything added; increase; augmentation; as, a piazza is an addition to a building. [ 1913 Webster ]

3. (Math.) That part of arithmetic which treats of adding numbers. [ 1913 Webster ]

4. (Mus.) A dot at the right side of a note as an indication that its sound is to be lengthened one half. [ R. ] [ 1913 Webster ]

5. (Law) 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. [ 1913 Webster ]

6. (Her.) Something added to a coat of arms, as a mark of honor; -- opposed to abatement. [ 1913 Webster ]

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. [ 1913 Webster ]

Syn. -- Increase; accession; augmentation; appendage; adjunct. [ 1913 Webster ]