[n] something added to what you have already; "the librarian shelved the new accessions"; "he was a new addition to the staff"
[n] the act of adding one thing to another; "the addition of flowers created a pleasing effect"; "the addition of a leap day every four years"
[n] the arithmetic operation of summing; calculating the sum of two or more numbers; "the summation of four and three gives seven"; "four plus three equals seven"
[n] a component that is added to something to improve it; "the addition of a bathroom was a major improvement"; "the addition of cinammon improved the flavor"
[n] a suburban area laid out in streets and lots for a future residential area
[n] a quantity that is added; "there was an addition to property taxes this year"; "they recorded the cattle's gain in weight over a period of weeks"

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

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

3. (Math.) That part of arithmetic which treats of adding
numbers.

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

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.

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

lines, or vectors, AB and BC, by which their sum is
regarded as the line, or vector, AC.

Syn: Increase; accession; augmentation; appendage; adjunct.

Synonyms: accession, gain, improver, increase, plus, summation

Antonyms: deduction, subtraction

See Also: accretion, acquisition, additive, afterthought, annex, annexation, annexe, arithmetic operation, attachment, component, constituent, element, elongation, extension, fluoridation, fluoridisation, fluoridization, increase, indefinite quantity, retrofit, step-up, suburb, suburban area, suburbia, wing

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