dually

dual

[doo-uhl, dyoo-]
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.

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

dually, adverb

dual, duel.
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World English Dictionary
dual (ˈdjuːəl)
 
adj
1.  relating to or denoting two
2.  twofold; double
3.  (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
4.  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
 
n
5.  grammar
 a.  the dual number
 b.  a dual form of a word
 
vb , duals, dualling, dualled
6.  (Brit) (tr) to make (a road) into a dual carriageway
 
[C17: from Latin duālis concerning two, from duo two]
 
'dually
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

dual
c.1600, from L. dualis, from duo "two." Related: Dually.
Online Etymology Dictionary, © 2010 Douglas Harper
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