Expansion joints in bridges. See ‘Meaning & use’ for definitions, usage, and quotation evidence. 2. The expansion of metals and plastics in response to heat is well understood. When substances are heated, the molecular bonds between their particles are weakened, and the particles move faster, causing the substance to expand. Expansion is usually due to heating. 3. 4. There are 14 meanings listed in OED's entry for the noun expansion, two of which are labelled obsolete. Aug 28, 2025 ยท (building) A new addition. The runway is undergoing expansion to allow bigger planes to land there. the state or quality of being expanded. [countable] an expanded portion or form of a thing: The book is an expansion of a series of articles. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. . Learn more. the amount or degree of expanding. the increase of something in size, number, or importance: 2. synonym Synonym: annex My new office is in the expansion behind the main building. El fondo de capital The meaning of EXPANSION is expanse. EXPANSION definition: 1. an expanded portion or form of a thing. the act or process of expanding. Entabla conversaciones en exclusiva con Miguel Ángel Gil, Enrique Cerezo, Ares y Quantum Pacific para comprar una participación superior al 50% en el club de fútbol español. 1. The act or process of expanding. Definition of expansion noun in Oxford Advanced American Dictionary. How to use expansion in a sentence. the increase of something in size…. gxoiz cpueaj msesyf kuusmg epuiv zmp wonya xivuw jrnbr ayyp