Definition of number

• the property possessed by a sum or total or indefinite quantity of units or individuals; "he had a number of chores to do"; "the number of parameters is small"; "the figure was about a thousand"
• a concept of quantity derived from zero and units; "every number has a unique position in the sequence"
• a numeral or string of numerals that is used for identification; "she refused to give them her Social Security number"