What does numerator mean?
A numerator is the number above the line in a fraction. For example, in 2/3, the numerator is 2 and the denominator is 3; together they indicate that the fraction represents two of three equal parts of a whole. The word is also used more formally for a person or device that counts or assigns numbers. In everyday mathematical writing, numerator and denominator form a familiar paired vocabulary, and understanding the distinction helps with fraction arithmetic, ratios, and algebra. The numerator is sometimes informally called the top number, but the technical term is preferred in educational and professional contexts. The word comes from Latin and is related to number, numeral, numerate, and enumerate, all of which reflect ideas of counting or numbering.
The number above the line in a fraction, representing how many equal parts of the whole are considered.
"The numerator of the fraction is 5."
Often paired with denominator when explaining fractions or algebraic expressions.
A person or thing that counts or assigns numbers.
"The survey included a numerator for each category."
This sense is formal and less common than the mathematical meaning.
The plural is used when referring to multiple numerators, including multiple fractional numerators or multiple people or devices that count.
"The teacher wrote the numerators on the board."
The numerator tells you how many pieces you have; the denominator tells you how many pieces make the whole.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does numerator come from?
The word derives from Latin numerator, meaning “a numberer” or “counter,” from numerare, “to count,” and numerus, “number.” It entered English through Latin usage associated with mathematical fractions. Its cognates include number, numeral, numerate, and enumerate, all of which developed from the same Latin root for counting and numbering.
How numerator is actually used
In mathematics, the term is standard in British and US English. Its broader meaning as a person who counts is formal and relatively uncommon.
Easily confused with numerator
A numerator is the number above the fraction bar, while a denominator is the number below it indicating the size of one equal part.