Pronunciation (UK) IPA (key): /ˈkuːl.ə(r)/ SAMPA: /"ku:l.@(r)/ Audio (US)(file) Noun Singular cooler Plural coolers (countable) A cooler is a box that is used with ice to help keep things cold. Pack all of the soda into the cooler; we wouldn't want it to get flat. (slang) A cooler is a prison. (countable & uncountable) A cooler is a kind of mixed drink. They served wine coolers at the party. Adjective Positive cool Comparative cooler Superlative coolest The comparative form of cool; more cool.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads