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Cal. an abbreviation for large calorie, or large calories; the amount of energy needed to raise the temperature of one kilogram of water one degree Celsius. [1/2 definitions]
gram1 the basic unit of weight in the metric system, equal to one thousandth of a kilogram or 0.0353 ounce. (abbreviated: g)
kg an abbreviation for kilogram, or kilograms.
kilo see kilogram.