1. noun /ˈnʌm.bə(ɹ),ˈnʌm.bɚ/
Zero, one, -1, 2.5, and pi are all numbers.
The number 8 is usually made with a single stroke.
2. verb /ˈnʌm.bə(ɹ),ˈnʌm.bɚ/
Number the baskets so that we can find them easily.
I don’t know how many books are in the library, but they must number in the thousands.
Wikipedia foundation.