The American Heritage® Dictionary of the English Language, 4th Edition
n. Mathematics A member of the set of positive whole numbers {1, 2, 3, . . . }, negative whole numbers {-1, -2, -3, . . . }, and zero {0}.
n. Mathematics A complete unit or entity.
the GNU version of the Collaborative International Dictionary of English
n. A complete entity; a whole number, in contradistinction to a fraction or a mixed number.
The Century Dictionary and Cyclopedia
n. An entire entity; particularly, in arithmetic, a whole number, in contradistinction to a fraction. Thus, in the number 54.7, 54 is an integer, and .7 a fraction (seven tenths of a unit).
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. any of the natural numbers (positive or negative) or zero