subset

[suhb-set]
noun
1.
a set that is a part of a larger set.
2.
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

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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
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Etymonline
Word Origin & History

subset
"subordinate set," 1902, from sub- + set (n.).
Online Etymology Dictionary, © 2010 Douglas Harper
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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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for subsets
Vehicle and boat registration fees are subsets of this kind of tax.
So far, this has only been done for restricted subsets of python.
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