Meaning

noun a person eating a meal (especially in a restaurant)

noun a passenger car where food is served in transit

noun a restaurant that resembles a dining car

originEtymology tree English dine Proto-Indo-European *-yósder. Proto-Italic *-āzijos Latin -āriusnom. Latin -āriusbor. Proto-Germanic *-ārijaz Proto-West Germanic *-ārī Old English -ere Middle English -ere English -er English diner From dine + -er.

Etymology from Wiktionary, CC BY-SA 3.0