divisor : Idioms & Phrases
Common divisor
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noun an integer that divides two (or more) other integers evenly
common measure; common factor.
WordNet
(Math.) , a number or quantity that divides two or more numbers or quantities without a remainder; a common measure.
Webster 1913
greatest common divisor
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noun the largest integer that divides without remainder into a set of integers
greatest common factor; highest common factor.