<p><strong>Adjective:</strong></p><ul><li>Of, relating to, or noting two.</li><li>Composed or consisting of two people, items, parts, etc., together; twofold; double.</li><li>Example: Dual ownership; dual controls on a plane.</li><li>Having a twofold, or double, character or nature.</li></ul><p><strong>Noun (Grammar):</strong></p><ul><li>The dual number.</li><li>A form in the dual, as in Old English "git" meaning "you two," contrasted with "ge" referring to three or more.</li></ul>