equation
US /ɪˈkweɪ.ʒən/
UK /ɪˈkweɪ.ʒən/

1.
a statement that the values of two mathematical expressions are equal (indicated by the sign =)
:
•
Solve the equation for x.
•
The teacher wrote a complex equation on the board.
2.
the process of equating one thing with another
:
•
The equation of wealth with happiness is a common misconception.
•
There are many factors in the equation of success.