<p><strong>Noun</strong></p><ul><li>The product of a given positive integer multiplied by all lesser positive integers: The quantity four factorial (4!) = 4 ⋅ 3 ⋅ 2 ⋅ 1 = 24: n!, where n is the given integer.</li></ul><p><strong>Adjective</strong></p><ul><li>Of or relating to factors or factorials.</li><li>Of or relating to a factor or a factory.</li></ul>