Definition of "addition" in English

noun

1. (uncountable) The act of adding anything.

   • The addition of five more items to the agenda will make the meeting unbearably long.

2. Anything that is added.

3. (uncountable, arithmetic) The arithmetic operation of adding.

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

5. (chiefly law) A title annexed to a person's name to identify him or her more precisely.

6. (heraldry) Something added to a coat of arms, as a mark of honour.

7. (organic chemistry) an organic reaction where two or more molecules combine to form a larger one (the adduct).