expansion

noun
ex·​pan·​sion | \ ik-ˈspan(t)-shən \

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
5a : 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 , -​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 This book is an expansion of a lecture series.
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Recent Examples on the Web

Throughout Season 4, Outlander has slowly splintered away from a razor-sharp focus on Claire and Jamie to make room for Brianna and Roger—an expansion from the original duo to a quartet. Julie Kosin, Harper's BAZAAR, "Caitriona Balfe Is Evolving with Outlander," 31 Dec. 2018 The book goes into excruciating detail about the evolution of the company, which eventually changed its name to SureWest Communications following the purchase of WinFirst Communications, and expansion into the greater Sacramento area. Cyrus Farivar, Ars Technica, "Try your hand at being an operator at the Roseville Telephone Museum," 22 Dec. 2018 Some examples: In Florida, organizers succeeded in passing the largest expansion of voting rights in a decade, restoring the right to vote to 1.5 million people with felony convictions. Bree Newsome, SELF, "The 2018 Midterm Elections Proved That Change Must Happen from the Ground Up," 15 Nov. 2018 Florida voters made possible one of largest expansions of voting rights in the country since the Voting Rights Act of 1965, according to Public Citizen. Jenn M. Jackson, Teen Vogue, "The Midterms May Have Broken Your Heart, but There's Still Hope," 8 Nov. 2018 More recently, the spirit of aether has even come back into the discussion of the cosmos, thanks to the mysterious discoveries of dark matter and dark energy, the elusive force believed to be the cause of the accelerating expansion of the universe. Meg Neal, Popular Mechanics, "The Eternal Quest for Aether, the Cosmic Stuff That Never Was," 19 Oct. 2018 Uber/Jump Dookeran, part of the company’s new mobility team, sees Santa Monica as a testing ground for the company’s future expansion. Patrick Sisson, Curbed, "Uber launches electric scooter service," 3 Oct. 2018 Kors, which also owns Jimmy Choo, plans to invest in an expansion of Versace retail outlets (from 200 to 3oo stores worldwide) and e-commerce with the aim of growing the company's revenue to $2 billion annually. Sam Dangremond, Town & Country, "How Much Is Donatella Versace Worth?," 25 Sep. 2018 According to cofounder Tim Brown, Allbirds’ expansion into sandals has been nearly three years in the making, as part of its mission to revamp classic shoe styles with sustainable production practices. Halie Lesavage, Glamour, "Allbirds Is Launching—Wait for It—Flip-Flops," 1 Aug. 2018

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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Statistics for expansion

Last Updated

20 Jan 2019

Look-up Popularity

Time Traveler for expansion

The first known use of expansion was in 1611

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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

expansion

noun
ex·​pan·​sion | \ ik-ˈspan-shən \

Kids Definition of expansion

: the act of growing or increasing : enlargement

expansion

noun
ex·​pan·​sion | \ ik-ˈspan-chən \

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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