Meaning of “number” - Learner’s Dictionary

number

noun [ C ] uk us /ˈnʌmbər/
SYMBOL

A1 a symbol or word used in a counting system or used to show the position or order of something:

Think of a number smaller than 100.
Pablo's favourite number is seven.
The Prime Minister lives at number 10, Downing Street.
Look at item number three on your agenda.
GROUP OF NUMBERS

A1 a group of numbers that represents something:

What's your phone number?
Each person receives a membership number when they join.
AMOUNT

B1 an amount:

a small number of (= a few)
a large number of (= many)
There were a number of (= several) soldiers present at the rally.
Scientists have noticed a drop in the number of song birds in Britain.
→ See also cardinal number , ordinal number , phone number , telephone number

(Definition of “number noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)