expansion

[ ik-span-shuhn ]

noun

1. the act or process of expanding.
2. the state or quality of being expanded.
3. the amount or degree of expanding.
4. an expanded, dilated, or enlarged portion or form of a thing:

   The present article is an expansion of one he wrote last year.

5. anything spread out; expanse.
6. Mathematics.
   1. the development at length of an expression indicated in a contracted form, as a 2 + 2 ab + b 2 for the expression ( a + b ) 2 .
   2. any mathematical series that converges to a function for specified values in the domain of the function, as 1 + x + x 2 + … for 1/(1 − x ) when x < 1.
7. Machinery. that part of the operation of an engine in which the volume of the working medium increases and its pressure decreases.
8. an increase in economic and industrial activity ( contraction ).
9. 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.

expansion

/ ɪkˈspænʃən /

noun

1. the act of expanding or the state of being expanded
2. something expanded; an expanded surface or part
3. the degree, extent, or amount by which something expands
4. an increase, enlargement, or development, esp in the activities of a company
5. maths
   1. the form of an expression or function when it is written as the sum or product of its terms
   2. the act or process of determining this expanded form
6. the part of an engine cycle in which the working fluid does useful work by increasing in volume
7. the increase in the dimensions of a body or substance when subjected to an increase in temperature, internal pressure, etc

expansion

/ ĭk-spăn′shən /

1. 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.
2. A number or other mathematical expression written in an extended form. For example, a ² + 2 ab + b ² is the expansion of ( a + b ) ².

Derived Forms

• exˈpansionary, adjective

Other Words From

• 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

Word History and Origins

Origin of expansion¹

First recorded in 1605–15; from Late Latin expānsiōn-, stem of expānsiō; equivalent to expanse + -ion

Example Sentences

The expansion of queer online communities has allowed Li Shuning, an estate planning lawyer based in Shenzhen, to reach more LGBTQ+ clients through social media.

From Los Angeles Times

Disney’s so-called experiences business, which includes the theme parks and merchandise, saw more muted growth in the fourth quarter due to inflation, cruise line expansion costs and softer results at international parks.

From Los Angeles Times

This ushered in a wave of reforms, including the expansion of the officer candidate pool, which had previously been limited to members of the Metropolitan Division.

From Los Angeles Times

Challenged on the expansion of the Senedd, the first minister said the legislature is "much smaller than other parliaments".

From BBC

Trump already introduced tariffs in his first term, citing Section 232 of the Trade Expansion Act of 1962, which empowers a president to impose duties on goods that could affect US national security.

From BBC

Related Words

• development
• enlargement
• extension
• increase
• inflation
• spread