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
That foundation of family support has fueled its expansion into year-round programming, including automotive education, STEM experiences, scholarship awards and multiple car shows.
—
Melissa Noel, Essence, 2 Aug. 2025
The company expects to have around 500 employees and contractors at the center by the end of 2025.
Microsoft Corp. has begun hiring employees for its $3.3 billion data center opening in Mount Pleasant in early 2026, and is proceeding with expansion plans at the 1,900 acre-site.
—Rick Barrett, jsonline.com, 2 Aug. 2025
All of us wanted an expansion of this character, and in particular, the expansion of the relationship with Mr. Wolf.
—Jazz Tangcay, Variety, 2 Aug. 2025
Harry Potter fans have a new destination to look forward to as Warner Bros. is bringing a spellbinding new theme park attraction Abu Dhabi’s Yas Island in a major expansion of the beloved franchise.
—Caroline Reid, Forbes.com, 2 Aug. 2025
See All Example Sentences for expansion
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Melissa Noel, Essence, 2 Aug. 2025
The company expects to have around 500 employees and contractors at the center by the end of 2025.
Microsoft Corp. has begun hiring employees for its $3.3 billion data center opening in Mount Pleasant in early 2026, and is proceeding with expansion plans at the 1,900 acre-site.
—Rick Barrett, jsonline.com, 2 Aug. 2025
All of us wanted an expansion of this character, and in particular, the expansion of the relationship with Mr. Wolf.
—Jazz Tangcay, Variety, 2 Aug. 2025
Harry Potter fans have a new destination to look forward to as Warner Bros. is bringing a spellbinding new theme park attraction Abu Dhabi’s Yas Island in a major expansion of the beloved franchise.
—Caroline Reid, Forbes.com, 2 Aug. 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 6 Aug. 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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