The term whole number does not have a consistent definition. Various authors use it in one of the following senses:

• the nonnegative integers (0, 1, 2, 3, ...)
• the positive integers (1, 2, 3, ...)
• all integers (..., -3, -2, -1, 0, 1, 2, 3, ...).

See natural number for some information about the evolution of the term.

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