greatest common divisor

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

• noun The largest number that divides evenly into each of a given set of numbers.

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

• noun The greatest common divisor of a set is the largest positive integer or polynomial that divides each of the numbers in the set without remainder.

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

• noun the largest integer that divides without remainder into a set of integers