unitfraction

2. A fraction whose numerator is exactly one and whose denominator is a positive whole number.

One third and one eighth are both unit fractions.

3. In Egyptian mathematics, a fraction written as a sum of distinct unit fractions.

The scribes wrote three quarters as one half plus one quarter.

4. A fraction used as a building block when splitting a whole into equal parts.

Each slice of the pie is a unit fraction of the whole pie.