expansion
noun
ex·pan·sion
ik-ˈspan(t)-shən 
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
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
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
Other communities receiving grants include Bristol for the 10.69 acres Hoppers-Birge Pond Nature Preserve expansion on Perkins Street.
—
Sean Krofssik, Hartford Courant, 22 July 2025
The South Korean battery maker, the largest in the country, completed expansion of its Holland, Michigan, facility last month after investing over $1.4 billion to manufacture batteries for storage systems.
—Jackie Charniga, USA Today, 22 July 2025
In each case, Bleacher Report plans to invest more in its coverage of those sports airing on TNT after seeing audience growth from previous expansions.
—Jacob Feldman, Sportico.com, 22 July 2025
Samsung has revealed a major expansion of the licensing programme for its Tizen OS TV smart system that will see it being introduced on TVs from a host of new TV brands in multiple territories across the world.
—John Archer, Forbes.com, 22 July 2025
See All Example Sentences for expansion
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Sean Krofssik, Hartford Courant, 22 July 2025
The South Korean battery maker, the largest in the country, completed expansion of its Holland, Michigan, facility last month after investing over $1.4 billion to manufacture batteries for storage systems.
—Jackie Charniga, USA Today, 22 July 2025
In each case, Bleacher Report plans to invest more in its coverage of those sports airing on TNT after seeing audience growth from previous expansions.
—Jacob Feldman, Sportico.com, 22 July 2025
Samsung has revealed a major expansion of the licensing programme for its Tizen OS TV smart system that will see it being introduced on TVs from a host of new TV brands in multiple territories across the world.
—John Archer, Forbes.com, 22 July 2025
See All Example Sentences for expansion
Cite this Entry
“Expansion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/expansion. Accessed 25 Jul. 2025.
Copy CitationKids Definition
expansion
noun
ex·pan·sion
ik-ˈspan-chən
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
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