the principle that any proposition must be either true or false.
- Law of excitation
law of excitation n. The principle that a motor nerve responds to the alteration of value of an electric current from moment to moment.
noun, Mathematics. 1. the theorem stating the elementary properties of exponents, as the property that the product of the same bases, each raised to an exponent, is equal to the base raised to the sum of the exponents: xa ⋅ xb = xa + b .
- Law of heart
law of heart n. The principle that the energy released by the heart when it contracts is a function of the length of its muscle fibers at the end of diastole. Also called Starling’s law.
noun, Logic. 1. the law that any proposition implies itself.