<p><strong>Noun:</strong></p><ul><li>A number or quantity placed (generally) before and multiplying another quantity, as 3 in the expression 3x.</li><li>A number that is constant for a given substance, body, or process under certain specified conditions, serving as a measure of one of its properties: coefficient of friction.</li></ul><p><strong>Adjective:</strong></p><ul><li>Acting in consort; cooperating.</li></ul>