<p><strong>Noun</strong></p><ul><li>the state or fact of being equivalent; equality in value, force, significance, etc.</li><li>an instance of this; an equivalent.</li><li>Chemistry. the quality of having equal valence.</li><li>Logic, Mathematics. Also called material implication. the relation between two propositions such that the second is not false when the first is true.</li><li>Also called material equivalence. the relation between two propositions such that they are either both true or both false.</li><li>the relation between two propositions such that each logically implies the other.</li></ul><p><strong>Adjective</strong></p><ul><li>(of a logical or mathematical relationship) reflexive, symmetrical, and transitive.</li></ul><p><strong>End of Response</strong></p>