expansion

noun

ex·​pan·​sion ik-ˈspan(t)-shən How to pronounce expansion (audio)
1
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
5
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
expansional 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.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Madrid Content City has already become one of the largest audiovisual hubs in Europe and is now entering phase IV of its expansion, expected to be completed by 2026. Georg Szalai, HollywoodReporter, 1 Oct. 2025 Examples of such risks may include significant business expansions, M&A, or launching new products. Sheryl Estrada, Fortune, 1 Oct. 2025 Social media lit up after Erewhon, the upscale grocery chain, teased a possible expansion. Diana Leyva, Nashville Tennessean, 1 Oct. 2025 The Rays were an American League expansion team in 1998. Barry M. Bloom, Sportico.com, 1 Oct. 2025 See All Example Sentences for expansion

Word History

First Known Use

1611, in the meaning defined at sense 1

Time Traveler
The first known use of expansion was in 1611

Browse Nearby Words

Cite this Entry

“Expansion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/expansion. Accessed 8 Oct. 2025.

Kids Definition

expansion

noun
ex·​pan·​sion ik-ˈspan-chən How to pronounce expansion (audio)
1
: the act of expanding
2
: the state of being expanded
3
: something expanded or a result of expanding
4
: the result of carrying out indicated mathematical operations
the expansion of (a + b)2 is a2 + 2ab + b2

Medical Definition

expansion

noun
ex·​pan·​sion ik-ˈspan-chən How to pronounce expansion (audio)
1
: the act or process of expanding
2
: the quality or state of being expanded

More from Merriam-Webster on expansion

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