What is the meaning of Addition?

The act of adding anything.

Anything that is added.

The arithmetic operation of adding.

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

A title annexed to a person's name to identify him or her more precisely.

Something added to a coat of arms, as a mark of honour.

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

addition, act of adding

addition (operation of adding a number to another)

bill, check (written note of goods sold, services rendered, or work done, with the price or charge, in a bar or a restaurant)

an addition

Source: wiktionary.org