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subset

[suhb-set]

Origin

noun

a set that is a part of a larger set.

Mathematics. a set consisting of elements of a given set that can be the same as the given set or smaller.

Origin:
1900–05; sub- + set

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Subset is always a great word to know.

So is divisible. Does it mean:

capable of being evenly divided, without remainder

a variable in a functional relation whose value determines the value or values of other variables, such as x in the relation y = 3x

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Collins

World English Dictionary

subset (ˈsʌbˌsɛt)

—n
1.	maths
	a. a set the members of which are all members of some given class: A is a subset of B is usually written A⊆B
	b. proper subset A⊂B one that is strictly contained within a larger class and excludes some of its members
2.	a set within a larger set

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline

Word Origin & History

subset

"subordinate set," 1902, from sub- + set (n.).

American Heritage

Science Dictionary

subset (sŭb'sět') Pronunciation Key
A set whose members are all contained in another set. The set of positive integers, for example, is a subset of the set of integers.

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subset

sub·set