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From The Collaborative International Dictionary of English v.0.48:
Addition \Ad*di"tion\, 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]