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

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.

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

an act of increasing or making something increase in size, amount or importance. Despite the recession the company is confident of further expansion. The expansion of higher education …

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.

Expansion (geometry), stretching of geometric objects with flat sides Expansion (model theory), in mathematical logic, a mutual converse of a reduct Expansion card, in computing, a printed …

Expansion is the part of an engine cycle in which the fluid increases in volume and makes a part such as a piston or flywheel move. The expansion of the gas pushes the piston inside the …

Oct 31, 2025 · Borrowed from French expansion, from Latin expānsiō. By surface analysis, expand +‎ -sion.

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.

EXPANSION meaning: 1 : the act of becoming bigger or of making something bigger the act of expanding; 2 : a more complete and detailed written work or set of comments based on …