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Meaning of addition

ad•di•tion

Pronunciation: (u-dish'un), [key]
— n.
  1. the act or process of adding or uniting.
  2. the process of uniting two or more numbers into one sum, represented by the symbol +.
  3. the result of adding.
  4. something added.
  5. a wing, room, etc., added to a building, or abutting land added to real estate already owned.
  6. a reaction in which two or more substances combine to form another compound.
  7. as well as; besides: In addition to directing the play, she designed most of the scenery.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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