Number

1. An abstract entity used to describe quantity. Zero, -1, 2, 5 and pi are all numbers.
2. A numeral; a symbol for an non-negative integer. The number 8 is usually made with a single stroke.
3. Quantity. His army is vast in numbers.
4. A performance; especially, a single song or dance routine within a larger show. For the second number, she sang "In the Moonlight."
5. A person (informal). She's a sweet little number.
6. (grammar) Adjectives, and nouns should agree in gender, number and case.
7. A telephone dialing code. Call me. Do you have my number?