addition
US /əˈdɪʃ.ən/
UK /əˈdɪʃ.ən/
1.
the action or process of adding something to something else
:
•
The addition of sugar made the cake sweeter.
•
The new wing is a welcome addition to the hospital.
2.
the process of calculating the total of two or more numbers
:
•
He's learning addition and subtraction in school.
•
The math problem required careful addition.