addition
nounUK /əˈdɪʃ.ən/
US /əˈdɪʃ.ən/
Addition is when you put numbers together to make a bigger number.
In math class, we practiced addition by adding two and three to get five.
RELATED WORDS
OTHER MEANINGS
2. Something that is added to something else.
The new playground was a great addition to the school.
3. The act of joining or putting things together.
The addition of a garage made the house bigger.
4. A building or room added to an existing building.
They built an addition onto the back of their house.