breakfastPronunciation: /ˈbrɛkfəst/Translate breakfast | into French | into German | into Italian | into Spanish Definition of breakfast noun a meal eaten in the morning, the first of the day:a breakfast of bacon and eggs [mass noun]:I don’t eat breakfast verb [no object] eat breakfast:she breakfasted on fried bread and baconPhrases have (or eat) someone for breakfast informal deal with or defeat someone with contemptuous ease. Derivatives breakfaster noun Origin: late Middle English: from the verb break1 + fast2breakfast in other Oxford dictionaries Definition of breakfast in the US English dictionary