<p><strong>Adjective</strong></p><ul><li>Consisting of or involving three; threefold; triple.</li><li>Third in order or rank.</li><li>Based on the number three.</li><li>Chemistry: Consisting of three different elements or groups.</li><li>(Formerly) Consisting of three atoms.</li><li>Mathematics: Having three variables.</li><li>Metallurgy: (Of an alloy) Having three principal constituents.</li></ul><p><strong>Noun</strong></p><ul><li>A group of three.</li></ul><p><strong>End of Response</strong></p>