- 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.
- 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
Examples from the Web for expansion
He recently put up $50 million for half the cost of the Kennedy Center expansion, where he is chairman of the board.Patriotic Philanthropy: Not an Oxymoron
November 27, 2014
He also has backed Medicaid expansion and a state-run exchange under Obamacare.The Secret GOP Swing State Election Romp
October 28, 2014
The era of expansion is over, to be replaced by an emphasis on ensuring the security of the existing members.Did Vladimir Putin Just Save NATO?
September 4, 2014
Concerns about the proliferation of these labs date back to shortly after the expansion began in the early 2000s.Growing Number of Biosafety Labs Raises Red Flags
Center for Public Integrity
August 20, 2014
The Royal Navy, Zambellas said, “is seeing signs of expansion—which is a really weird place to be.”Britain's High-Tech New Plan to Rule the Waves
August 14, 2014
The best hope for peace in our world is the expansion of freedom in all the world.
In an unwonted mood of expansion he turned to Mali-ya-bwana.The Leopard Woman
Stewart Edward White
Here the first step is absorption and expansion, not precipitation.Life: Its True Genesis
R. W. Wright
I will not run the risk of weakening this reasoning by expansion.Old-Fashioned Ethics and Common-Sense Metaphysics
William Thomas Thornton
Such was the law of expansion; the earth was the heritage of the most numerous race.Fruitfulness
- 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
- 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
Word Origin and History for expansion
1610s, "anything spread out;" 1640s, "act of expanding," from French expansion, from Late Latin expansionem (nominative expansio) "a spreading out," noun of action from past participle stem of Latin expandere (see expand).
- An increase in size.
- The spreading out of a structure, such as a tendon.
- 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.