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cal.1 abbreviation of "caliber."
Cal.1 abbreviation of "large calorie," or "large calories"; the amount of energy needed to raise the temperature of one kilogram of water one degree Celsius.
cal.2 abbreviation of "small calorie," or "small calories," a unit of heat equal to the amount necessary to raise the temperature of one gram of water one degree Celsius, also known as "gram calorie."
Cal.2 an abbreviation of "California," a U.S. state on the west coast.