[doo-uh
l, dyoo-] 
| 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. |
| 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. |