cardinal number

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A number, such as 3 or 11 or 412, used in counting to indicate quantity but not order.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A number used to denote quantity; a counting number.
• noun mathematics A generalized kind of number used to denote the size of a set, including infinite sets.
• noun grammar A word that expresses a countable quantity; a cardinal numeral.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the number of elements in a mathematical set; denotes a quantity but not the order