1. Also called gram Calorie, small Calorie

2. Today, the term Calorie has two meanings: the small Calorie (cal) and the large Calorie, kiloCalorie (kcal)

3. Definition of Calorie 1 a : the amount of heat required at a pressure of one atmosphere to raise the temperature of one gram of water one degree Celsius that is equal to about 4.19 joules —abbreviation cal — called also gram Calorie, small Calorie