/əˈdɪʃ(ə)n/
N. a person or thing added or joined, typically in order to improve something.
- You will find the coat a useful addition to your wardrobe.
N. The addition of something is the fact that it is added to something else.
- It was completely refurbished in 1987, with the addition of a picnic site.
- Multiplications and divisions are really just many additions and subtractions.
- The hotel has been extended with the addition of more rooms.