1. The act of adding two or more things together; opposed to subtraction or diminution. This endless addition or addibility of numbers.

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

3. (Science: mathematics) That part of arithmetic which treats of adding numbers.

4. A dot at the right side of a note as an indication that its sound is to be lengthened one half.

5. 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.

6. Something added to a coat of arms, as a mark of honor; opposed to abatement.

(Science: geometry) vector addition, that kind of addition of two lines, or vectors, ab and BC, by which their sum is regarded as the line, or vector, AC.

Synonym: increase, accession, augmentation, appendage, adjunct.

Origin: f. Addition, L. Additio, fr. Addere to add.

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