expansion
the act or process of expanding.
the state or quality of being expanded.
the amount or degree of expanding.
an expanded, dilated, or enlarged portion or form of a thing: The present article is an expansion of one he wrote last year.
anything spread out; expanse.
Mathematics.
the development at length of an expression indicated in a contracted form, as a2 + 2ab + b2 for the expression (a + b)2.
any mathematical series that converges to a function for specified values in the domain of the function, as 1 + x + x2 + … for 1/(1 − x) when x< 1.
Machinery. that part of the operation of an engine in which the volume of the working medium increases and its pressure decreases.
an increase in economic and industrial activity (opposed to contraction).
additional content for a video game, card game, board game, etc., that significantly expands or alters the way the game is played: I really improved my deck with cards from the latest expansion.You can play the stand-alone expansion without ever buying the original game.
Origin of expansion
1Other words from expansion
- ex·pan·sion·al, adjective
- an·ti·ex·pan·sion, adjective
- non·ex·pan·sion, noun
- o·ver·ex·pan·sion, noun
- pre·ex·pan·sion, noun
- re·ex·pan·sion, noun
- self-ex·pan·sion, noun
- su·per·ex·pan·sion, noun
Words Nearby expansion
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use expansion in a sentence
Still, the expansion in testing alone can’t fully explain the current case uptick, at least not in every country.
China is a great nation, and we should hope for the continued expansion.
Trump’s most popular YouTube ad is a stew of manipulated video | Glenn Kessler, Meg Kelly | September 17, 2020 | Washington PostMany factors are driving the violent expansion of this years' wildfires.
West Coast wildfire smoke is visible from outer space | María Paula Rubiano A. | September 16, 2020 | Popular-ScienceA few days later, Pfizer announced plans to expand the number of participants enrolled in its clinical trials by the thousands but gave little details on the expansion.
AstraZeneca resumed its COVID-19 vaccine trials after uncovering a mysterious reaction | Claire Maldarelli | September 15, 2020 | Popular-ScienceIn April, there was an hourlong “Election Administration Forum Conference Call” that covered, in part, the expansion of mail-in voting and “ways to message these concerns to your constituents,” according to the invitation.
No Democrats Allowed: A Conservative Lawyer Holds Secret Voter Fraud Meetings With State Election Officials | by Mike Spies, Jake Pearson and Jessica Huseman | September 15, 2020 | ProPublica
Missy Suicide, formerly known as Selena Mooney, is in New York for a series of brand-expansion meetings.
Masters of Alt Sex: SuicideGirls Hits Puberty and Wants to Invade Your TV Set | Marlow Stern | December 9, 2014 | THE DAILY BEASTHe recently put up $50 million for half the cost of the Kennedy Center expansion, where he is chairman of the board.
Tellingly, but not coincidentally, the greatest expansion of Medicaid has occurred in Deep Blue America.
With Immigration Move, Obama and the Welfare Party Strike Again | Lloyd Green | November 24, 2014 | THE DAILY BEASTEven the most adamant Obamacare opponent must acknowledge, as Kasich has, that its coverage expansion has helped some people.
John Kasich: The GOP’s Hobbled 2016 Dark Horse | W. James Antle III | November 3, 2014 | THE DAILY BEASTHe also has backed Medicaid expansion and a state-run exchange under Obamacare.
This engine only took steam during the first quarter of its stroke, the remaining three-quarters were by the expansion.
Life of Richard Trevithick, Volume II (of 2) | Francis TrevithickThis most simple steam-engine combined in the greatest degree the two elements of expansion and momentum.
Life of Richard Trevithick, Volume II (of 2) | Francis TrevithickThe coal burnt under the boiler gives a duty of sixty-six millions, or an expansion of 60 per cent.
Life of Richard Trevithick, Volume II (of 2) | Francis TrevithickEvery step which she took toward relieving herself from obligations added to her strength and expansion as an individual.
The Awakening and Selected Short Stories | Kate ChopinThe settlement no doubt was influenced by the imminence of a large expansion of policy—the ill-starred Irish expedition.
King Robert the Bruce | A. F. Murison
British Dictionary definitions for expansion
/ (ɪkˈspænʃən) /
the act of expanding or the state of being expanded
something expanded; an expanded surface or part
the degree, extent, or amount by which something expands
an increase, enlargement, or development, esp in the activities of a company
maths
the form of an expression or function when it is written as the sum or product of its terms
the act or process of determining this expanded form
the part of an engine cycle in which the working fluid does useful work by increasing in volume
the increase in the dimensions of a body or substance when subjected to an increase in temperature, internal pressure, etc
Derived forms of expansion
- expansionary, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for expansion
[ ĭk-spăn′shən ]
An increase in the volume of a substance while its mass remains the same. Expansion is usually due to heating. When substances are heated, the molecular bonds between their particles are weakened, and the particles move faster, causing the substance to expand.
A number or other mathematical expression written in an extended form. For example, a2 + 2ab + b2 is the expansion of (a + b)2.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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