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
Companies like Aldi, JD Sports (JD), and Burlington Stores (BURL) are leading the way with new expansions in 2025.
—
Francisco Velasquez, Quartz, 28 Feb. 2025
These acres include an expansion of the famed Cathedral Pines Preserve, which hosts some of the last remaining old forest in the state, and the Trinity Forest Preserve.
—Shelley Harms, Hartford Courant, 28 Feb. 2025
Mercury retrograde in Aries on March 15th brings your focus to higher learning, travel, and expansion.
—Dossé-Via Trenou, refinery29.com, 27 Feb. 2025
This initiative represents an expansion of Rémy Martin’s ongoing investment in culture and community.
—Kimberly Wilson, Essence, 27 Feb. 2025
See All Example Sentences for expansion
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Francisco Velasquez, Quartz, 28 Feb. 2025
These acres include an expansion of the famed Cathedral Pines Preserve, which hosts some of the last remaining old forest in the state, and the Trinity Forest Preserve.
—Shelley Harms, Hartford Courant, 28 Feb. 2025
Mercury retrograde in Aries on March 15th brings your focus to higher learning, travel, and expansion.
—Dossé-Via Trenou, refinery29.com, 27 Feb. 2025
This initiative represents an expansion of Rémy Martin’s ongoing investment in culture and community.
—Kimberly Wilson, Essence, 27 Feb. 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 18 Apr. 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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