noun🔗ShareA non-SI unit of energy equal to 1,000 calories, used (now rare) in chemistry or physics; equal to 1 calorie or Calorie as used in nutrition. Symbol kcal."The nutrition label stated that the cereal contained 200 kcal per serving. "energyfoodphysicschemistryscienceunitamounttechnicalChat with AIVocabulary GamePractice Reading