addition Meaning, Definition & Usage

  1. noun a component that is added to something to improve it
    improver; add-on.
    • the addition of a bathroom was a major improvement
    • the addition of cinnamon improved the flavor
  2. noun 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
  3. noun a quantity that is added
    increase; gain.
    • there was an addition to property taxes this year
    • they recorded the cattle's gain in weight over a period of weeks
  4. noun something added to what you already have
    accession.
    • the librarian shelved the new accessions
    • he was a new addition to the staff
  5. noun a suburban area laid out in streets and lots for a future residential area
  6. noun the arithmetic operation of summing; calculating the sum of two or more numbers
    summation; plus.
    • the summation of four and three gives seven
    • four plus three equals seven

WordNet

Ad*di"tion noun
Etymology
F. addition, L. additio, fr. addere to add.
Definitions
  1. The act of adding two or more things together; -- opposed to subtraction or diminution. "This endless addition or addibility of numbers." Locke.
  2. Anything added; increase; augmentation; as, a piazza is an addition to a building.
  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. Syn. -- Increase; accession; augmentation; appendage; adjunct.

Webster 1913