expansion

noun
ex·​pan·​sion | \ ik-ˈspan(t)-shən How to pronounce expansion (audio) \

Definition of expansion

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
5a : 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

Keep scrolling for more

Other Words from expansion

expansional \ ik-​ˈspanch-​nəl How to pronounce expansional (audio) , -​ˈspan(t)-​shə-​nᵊl \ adjective

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.
See More

Recent Examples on the Web

Bolay is the latest entrant into the hottest trend in restaurant expansion, the create-your-own-bowl niche where customers fill a bowl with veggies and meats then splash them with sauce. Kyle Arnold, OrlandoSentinel.com, "Bolay opening three 'bowl' eateries in Orlando area, first in Lake Nona," 5 July 2018 Advertising Congress approved the expansion in May and Trump signed the legislation in June. Calvin Woodward, The Seattle Times, "AP fact check: Trump hails an exoneration not offered," 25 Mar. 2019 But heavy expansion costs led to a loss of $1.93 billion. Eliot Brown, WSJ, "WeWork’s Annual Loss Doubles to Nearly $2 Billion Amid Rapid Expansion," 25 Mar. 2019 Then, there’s rental services like Rent the Runway and Armarium, which are both in expansion mode. Emily Farra, Vogue, "Will 2019 Be the Year We All Start Renting Out Our Own Closets?," 18 Mar. 2019 Nvidia equipped the board with three USB 2.0 ports, a USB 3.0 port, a MIPI-CSI camera connector, HDMI 2.0, DisplayPort 1.2, and I2S audio out, along with expansion options for a Wi-Fi card, a fan, and a UART header. Brad Chacos, PCWorld, "Nvidia's $99 Jetson Nano Developer Kit brings GPU-supercharged AI smarts to maker projects," 18 Mar. 2019 In 2017, the White House approved a fighting expansion against the militants in Somalia. Emily Bloch, Teen Vogue, "The Trump Administration Is Waging a Drone War in Somalia With Increased Air Strikes," 12 Mar. 2019 The ski-only, tony Deer Valley is wrapping up a $14-million-dollar expansion this year just in time for January’s annual Sundance Film Festival. Alex Postman, Condé Nast Traveler, "If You're Skiing the Rockies This Winter, Read This First," 4 Dec. 2018 With fashion week just around the corner too, the shade expansion comes at a pivotal time. Lindsay Schallon, Glamour, "MAC Is Now Offering 60 Shades of Foundation," 5 Sep. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'expansion.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of expansion

1611, in the meaning defined at sense 1

Keep scrolling for more

Learn More about expansion

Statistics for expansion

Last Updated

14 Apr 2019

Look-up Popularity

Time Traveler for expansion

The first known use of expansion was in 1611

See more words from the same year

Keep scrolling for more

More Definitions for expansion

expansion

noun

English Language Learners Definition of expansion

: the act of becoming bigger or of making something bigger : the act of expanding
: a more complete and detailed written work or set of comments based on something shorter

expansion

noun
ex·​pan·​sion | \ ik-ˈspan-shən How to pronounce expansion (audio) \

Kids Definition of expansion

: the act of growing or increasing : enlargement

expansion

noun
ex·​pan·​sion | \ ik-ˈspan-chən How to pronounce expansion (audio) \

Medical Definition of expansion

1 : the act or process of expanding
2 : the quality or state of being expanded

Keep scrolling for more

Comments on expansion

What made you want to look up expansion? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

marked by a state of overwhelming emotion

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Latin Quiz

  • roman forum
  • Which of the following months comes from a Latin word for “ten”?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!