Chemistry. the statement that in a pure compound the elements are always combined in fixed proportions by weight.
Logic. the law that either a proposition or its denial must be true.
- Law of dominance
law of dominance See under Mendel’s law.
- Law of effect
noun 1. (psychol) another name for Thorndike’s law See Thorndike
noun, Logic. 1. 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.