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

expansional

ik-ˈspan(t)-sh(ə-)nəl 

adjective

Synonyms

• accretion
• accrual
• addendum
• addition
• augmentation
• boost
• gain
• increase
• increment
• more
• plus
• proliferation
• raise
• rise
• step-up
• supplement
• uptick

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

Disney's capital expenditures totaled $5.4 billion, primarily for theme park expansions and new attractions. —Quartz Bot, Quartz, 14 Nov. 2024

Over the past five years, California’s economy ranked 13th-best for the expansion of its gross domestic product – the broadest measurement of business output. —Jonathan Lansner, Orange County Register, 14 Nov. 2024

The acquisition opens new doors for digital expansion and scientific events, allowing LabX to deepen its connection with the science community and provide readers with even more ways to explore and understand the world of science. —Discover Staff, Discover Magazine, 8 Nov. 2024

Asked if South Carolina should expand Medicaid, Simmer said the challenges South Carolina and other states confront are worsened by health care provider shortages and structural inequities too large and complicated for Medicaid expansion alone to solve. —Kff Health News, The Mercury News, 8 Nov. 2024

Word History

First Known Use

1611, in the meaning defined at sense 1

Phrases Containing expansion

• expansion card
• expansion slot

Kids 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 

1

: the act or process of expanding

2

: the quality or state of being expanded