###
Numerator
(noun)

- The top part of a fraction, representing the number of parts being considered.
- A quantity or measurement that is being counted or considered in a mathematical operation or calculation.

### Origin:

Derived from the latin word numerare, meaning 'to count', and is used in mathematics to describe the top part of a fraction that indicates the number of parts being considered.

### Examples:

- The numerator of the fraction is the number of pieces being counted.
- The numerator of the fraction 2/3 is 2, indicating that two parts out of three are being considered.
- The numerator of the fraction must be an integer.
- The numerator was used to calculate the average of the data set.
- The numerator and denominator of the fraction must have a common factor to simplify it.