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noun
ex·​pan·​sion | \ ik-ˈspan(t)-shən How to pronounce expansion (audio) \

Definition of expansion

1 : expanse
2 : the act or process of expanding territorial expansion economic expansion expansion of the universe
3 : the quality or state of being expanded
4 : the increase in volume of working fluid (such as steam) in an engine cylinder after cutoff or in an internal combustion engine after explosion
5College Grange Illini Red Illini Football Jerseys Jerseys Men Illinois 77 Sale-orange a : an expanded part
b : something that results from an act of expanding the book is an expansion of a lecture series
6 : the result of carrying out an indicated mathematical operation : the expression of a function in the form of a series

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Other Words from expansion

expansional \ ik-​ˈspanch-​nəl How to pronounce expansional (audio) , -​ˈspan(t)-​shə-​nᵊl \ adjective

Examples of expansion in a Sentence

The league is undergoing expansion. the expansion of a lecture series into a book
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Recent Examples on the Web

Burdette said the commissioners appear to be leaning toward a larger, 19,080-square-foot expansion rather than a 15,400-square-foot one or building at a new site, which is expected to cost about $8.5 million. Mack Jersey Black Khalil Mack Mack Khalil Jersey Black Khalil The South Bay favorite — the original Lisa’s was founded by Lisa Strauss in 1988 on Willow Glen’s Lincoln Avenue — was uprooted in 2017 by expansion plans at its longtime Pruneyard home. Linda Zavoral, The Mercury News, "Lisa’s Tea Treasures ready to reopen in new Campbell location," 25 July 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'expansion.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of expansion

1611, in the meaning defined at sense 1

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More Definitions for expansion

expansion

noun

English Language Learners Definition of expansion

: the act of becoming bigger or of making something bigger : the act of expanding
: a more complete and detailed written work or set of comments based on something shorter
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expansion

noun
ex·​pan·​sion | \ ik-ˈspan-shən How to pronounce expansion (audio) \

Kids Definition of expansion

expansion

noun
ex·​pan·​sion | \ ik-ˈspan-chən How to pronounce expansion (audio) \

Medical Definition of expansion

1 : the act or process of expanding
2 : the quality or state of being expanded

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Comments on expansion

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