Originally Posted by cuski

du·al /ˈduəl, ˈdyu-/ Pronunciation Key - Show Spelled Pronunciation[doo-uhl, dyoo-] Pronunciation Key

–adjective
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. Grammar. 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.
–noun Grammar.
5. the dual number.
6. a form in the dual, as Old English git “you two,” as contrasted with ge “you” referring to three or more.