- of, relating to, or noting two.
- composed or consisting of two people, items, parts, etc., together; twofold; double: dual ownership; dual controls on a plane.
- having a twofold, or double, character or nature.
- 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.
- the dual number.
- a form in the dual, as Old English git “you two,” as contrasted with ge “you” referring to three or more.
- relating to or denoting two
- twofold; double
- (in the grammar of Old English, Ancient Greek, and certain other languages) denoting a form of a word indicating that exactly two referents are being referred to
- maths logic (of structures or expressions) having the property that the interchange of certain pairs of terms, and usually the distribution of negation, yields equivalent structures or expressions
- the dual number
- a dual form of a word
verb duals, dualling or dualled
- (tr) British to make (a road) into a dual carriageway
c.1600, from Latin dualis, from duo “two” (see ). Related: Dually.