- noun a unit of measurement of heat equal to 1000 calories
- The amount of heat needed to raise the temperature of one kilogram of water one degree Celsius.
- A unit of heat energy equal to 103, or 1,000 calories, or 1 Calorie. Also called kilogram-calorie, although kilocalorie is the more proper term. Its abbreviation is kcal.
- The old unit of energy equivalent to 1000 calories. Often referred to as Calorie with a capital C and now replaced by the kilojoule. It is the energy necessary to heat 1 kg of water by 1°C.