dual

[ doo-uh l, dyoo- ]
/ ˈdu əl, ˈdyu- /

adjective

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.

noun Grammar.

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

Origin of dual

1535–45; < Latin duālis containing two, relating to a pair, equivalent to du(o) two + -ālis -al1

OTHER WORDS FROM dual

du·al·ly, adverb

WORDS THAT MAY BE CONFUSED WITH dual

dual duel
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for dualer

dual
/ (ˈdjuːəl) /

adjective

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

noun

grammar
  1. the dual number
  2. a dual form of a word

verb duals, dualling or dualled

(tr) British to make (a road) into a dual carriageway

Derived forms of dual

dually, adverb

Word Origin for dual

C17: from Latin duālis concerning two, from duo two
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012