1 expansion | Definition of expansion

expansion

noun
ex·​pan·​sion | \ ik-ˈspan(t)-shÉ™n 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
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

Keep scrolling for more

Other Words from expansion

expansional \ ik-​ˈspanch-​nÉ™l How to pronounce expansional (audio) , -​ˈspan(t)-​shÉ™-​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.
See More

Recent Examples on the Web

Aberdeen Fire Department is about to begin its largest undertaking in its 130-year history — a $7 million renovation and expansion of its main fire station on North Rogers Street in downtown. Erika Butler, baltimoresun.com, "Aberdeen Fire Department set to begin $7 million expansion to Rogers Street station next week," 11 Sep. 2019 The program, called Boston Saves, is an expansion of a three-year pilot program. Amir Vera, CNN, "Boston is giving every public school kindergartner $50 to promote saving for college or career training," 10 Sep. 2019 Some blamed new apartment development for putting too much strain on the system and others called for an expansion of the local power plant. Lila Seidman, Glendale News-Press, "Rolling power outages in Glendale that lasted days were caused by a transformer explosion, officials say," 10 Sep. 2019 The families at Andrews had been waiting for years for a major renovation and expansion. Washington Post, "Trump has a wall to build, so military kids will wait for better day care and schools," 6 Sep. 2019 What’s new in Fruitport is the extent to which such features are being baked into the renovation and expansion of an existing high school that has about 840 students. Blair Kamin, chicagotribune.com, "Column: A small town in the heartland redesigned its school to prevent shootings. But architecture can’t ensure kids’ safety.," 6 Sep. 2019 PalletOne CEO Howe Wallace said that the deal could lead to an expansion of services for the south Alabama market, including industrial recycling. al, "Baldwin County pallet maker sold on 25th anniversary," 3 Sep. 2019 The renovation and expansion of Verplanck Elementary School was not quite finished for a board of education walk-through Monday, but the contractor said the work will be done by the time students arrive next week. Jesse Leavenworth, courant.com, "Manchester school board tours newly renovated, expanded Verplanck Elementary School," 26 Aug. 2019 On the western side of the block, the Academy Museum of Motion Pictures is completing a renovation and expansion that adds a spherical, space-age theater to the remade May Co. Los Angeles Times, "Three design teams propose La Brea Tar Pits revamp. The mammoth’s future? Uncertain," 26 Aug. 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.

See More

First Known Use of expansion

1611, in the meaning defined at sense 1

Keep scrolling for more

Keep scrolling for more

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-shÉ™n How to pronounce expansion (audio) \

Kids Definition of expansion

: the act of growing or increasing : enlargement

expansion

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

Medical Definition of expansion