|Origin:||Latin calor 'heat'|
a unit for measuring the amount of energy that food will produce:
A potato has about 90 calories.
a calorie-controlled diet
a low-calorie snack
I need to burn off a few calories (=lose some weight by exercising).
My wife convinced me to finally start counting calories (=control my weight by being careful about what I eat).
the amount of heat that is needed to raise the temperature of one gram of water by one degree Celsius. It is used as a unit for measuring energy.