addition

noun7

1. •
   a new thing or person that joins something already there and makes it bigger or better
2. •
   The act of adding anything.

   • The addition of five more items to the agenda will make the meeting unbearably long.
3. •
   The arithmetic operation of adding.
4. •
   A title annexed to a person's name to identify him or her more precisely.

   • […]They clip vs drunkards, and with Swinish phrase / Soyle our addition, and indeede it takes / From our atchieuements, though perform’d at height / The pith and marrow of our attribute[…] — 1599
5. •
   Something added to a coat of arms, as a mark of honour.
6. •
   an organic reaction where two or more molecules combine to form a larger one (the adduct).
7. •
   A dot at the right side of a note as an indication that its sound is to be lengthened one half.