Definition of expansion in English:

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Pronunciation: /ikˈspanSHən/


1The action of becoming larger or more extensive: the rapid expansion of suburban Washington a small expansion of industry
More example sentences
  • Much of the rest of the country is paying the price of rapid economic expansion.
  • At the same time close links with the USA resulted in rapid economic recovery and expansion.
  • These years are post-integration and are from a period of rapid expansion of the industry.
growth, increase in size, enlargement, extension, development;
spread, proliferation, multiplication
1.1Extension of a state’s territory by encroaching on that of other nations, pursued as a political strategy: German expansion in the 1930s
More example sentences
  • It adopted a defensive strategy, recognizing that expansion of territory is costly in men and material.
  • We are currently laying plans for the establishment and territorial expansion of our nation.
  • Political instability and danger for the further expansion of the European Union are threatened.
1.2A thing formed by the enlargement, broadening, or development of something: the book is an expansion of a lecture given last year
More example sentences
  • This value signifies that the colony contains 37,800 sectors of cells having tract length expansions.
  • In a sense, this is an expansion of that book to cover the whole region.
  • ‘I think the ballparks are smaller, the players are stronger, and we've had two expansions in the last decade,’ said Selig.
elaboration, enlargement, amplification, development
1.3The increase in the volume of fuel on combustion in the cylinder of an engine, or the piston stroke in which this occurs.
Example sentences
  • If the operating temperature is higher than there is greater heat distortion due to thermal expansion hence increased friction.


Early 17th century: from late Latin expansion-, from Latin expandere (see expand).

Words that rhyme with expansion

mansion, scansion, stanchion

For editors and proofreaders

Syllabification: ex·pan·sion

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