Pronunciation (UK) IPA (key): /ɪkˈspləʊ.ʒən/ (US) IPA (key): /ɛkˈsploʊ.ʒən/ Audio (US)(file) Noun Singular explosion Plural explosions (countable) An explosion is when something explodes. The explosion destroyed the building. Related words explode explosiveWikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads