Pronunciation enPR: dī'nər, IPA (key): /ˈdaɪnə(r)/ Audio (UK)(file) Noun Singular diner Plural diners (countable) A diner is a place where people go to eat. It is like a cheap restaurant. The diner downtown was always busy late at night. (countable) A diner is a person who dines. The waitress made sure to keep the diner's coffee cup full. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads