Definition of multiple noun from the Oxford Advanced American Dictionary

 

multiple

 noun
noun
NAmE//ˈmʌltəpl//
 
(mathematics)
 
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a quantity that contains another quantity an exact number of times 14, 21, and 28 are all multiples of 7. 18 is the lowest common multiple of 6 and 9. Traveler's checks are available in multiples of $10 (= to the value of $10, $20, $30, etc.).
See the Oxford Advanced Learner's Dictionary entry: multiple