The meaning of EXPANSION is expanse. How to use expansion in a sentence.

EXPANSION definition: 1. the increase of something in size, number, or importance: 2. the increase of something in size…. Learn more.

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.

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 portion or form of a thing.

Definition of expansion noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

The runway is undergoing expansion to allow bigger planes to land there. [countable] an expanded portion or form of a thing: The book is an expansion of a series of articles.

The expansion of the universe is the increase in distance between gravitationally unbound parts of the observable universe with time. [1] It is an intrinsic expansion, so it does not mean that the …

There are 14 meanings listed in OED's entry for the noun expansion, two of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

Oct 31, 2025 · (building) A new addition. synonym Synonym: annex My new office is in the expansion behind the main building.

The act or process of expanding. The expansion of metals and plastics in response to heat is well understood.