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
Synonyms
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
L'Agence said this was meant to represent the company's international expansion.
—
Alyssa Goldberg, USA TODAY, 15 Feb. 2025
His firm designed the Marine Mammal Pavilion, a large and colorful expansion to the National Aquarium in Baltimore.
—Jacques Kelly, Baltimore Sun, 15 Feb. 2025
Looking ahead, projections indicate a remarkable expansion to approximately $2.3 billion by 2025, based on current exchange rates.
—Kurt Knutsson, Cyberguy Report, Fox News, 14 Feb. 2025
Getting to Mexico just got easier—and cheaper. Volaris Airlines, a major carrier throughout Mexico, recently announced dozens of new routes from the United States, with a major expansion that including the launch of service at New York/Newark Liberty International Airport (EWR).
—Michael Cappetta, Travel + Leisure, 14 Feb. 2025
See all Example Sentences for expansion 
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Alyssa Goldberg, USA TODAY, 15 Feb. 2025
His firm designed the Marine Mammal Pavilion, a large and colorful expansion to the National Aquarium in Baltimore.
—Jacques Kelly, Baltimore Sun, 15 Feb. 2025
Looking ahead, projections indicate a remarkable expansion to approximately $2.3 billion by 2025, based on current exchange rates.
—Kurt Knutsson, Cyberguy Report, Fox News, 14 Feb. 2025
Getting to Mexico just got easier—and cheaper. Volaris Airlines, a major carrier throughout Mexico, recently announced dozens of new routes from the United States, with a major expansion that including the launch of service at New York/Newark Liberty International Airport (EWR).
—Michael Cappetta, Travel + Leisure, 14 Feb. 2025
See all Example Sentences for expansion
Dictionary Entries Near expansion
Cite this Entry
“Expansion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/expansion. Accessed 20 Feb. 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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