Expansion is what happens when something becomes bigger or more extensive. See ‘meaning & use’ for definitions, usage, and quotation evidence. When substances are heated, the molecular bonds between their particles are weakened, and the particles move faster, causing the substance to expand.
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The state or quality of being expanded:[uncountable] future expansion of the business will require us to build more factories. The increase of something in size…. The act or process of expanding.
Expansion is usually due to heating.
Despite the recession the company is confident of further expansion. The increase of something in size, number, or importance: If you enjoy good pastry, you will be excited by the expansion of the bakery, but be careful or you will also. Expansion (countable and uncountable, plural expansions) the expansion of metals and plastics in response to heat is well understood.
The runway is undergoing expansion to allow bigger planes to land. The expansion of higher education. The state or quality of being expanded. An expanded portion or form of a thing.

An act of increasing or making something increase in size, amount or importance.
The meaning of expansion is expanse. How to use expansion in a sentence. The amount or degree of expanding. There are 14 meanings listed in oed's entry for the noun expansion, two of which are labelled obsolete.
Look up the expansion of 1018. Master the word expansion in english: