dual: Meaning and Definition of

du•al

1. of, pertaining to, or noting two.
2. composed or consisting of two people, items, parts, etc., together; twofold; double: dual ownership; dual controls on a plane.
3. having a twofold, or double, character or nature.
4. being or pertaining to a member of the category of number, as in Old English, Old Russian, or Arabic, that denotes two of the things in question.