Meaning of DUAL in English

DUAL

I. ˈd(y)]üəl, ]u̇əl also ]ül\ adjective

Etymology: Latin dualis, from duo two + -alis -al — more at two

1. of an inflectional form or grammatical number : denoting reference to two

Gothic wit “we two” is a first person dual pronoun

— compare plural , quadrual , singular , trial

2.

a. : consisting of two parts or elements : double , twofold

the dual tones of an American toad's song — W.P.Smith

that the work of a painter who looks important in England … has stood up to the dual test of international competition and the Adriatic sun — David Sylvester

b. : having two aspects : having a double character or nature

the man had a dual nature, one half positive and passionate to yearning, one half negative, satirical, and really perverse — H.S.Canby

immigrants, as a rule, retain a dual patriotism — Bertrand Russell

c. : containing two or being one of two often identical parts : twin

high-compression heads complete with a dual exhaust system — Gregor Felsen

d. : consisting of or used on a pair of wheels (as automotive driving wheels) joined together side by side (as by bolting or welding) on a common axle

dual tires

3. : characterized by a division of controlling agents or factors: as

a. : consisting of two sets of authorities having mutually exclusive spheres of power

a dual federalism

a dual form of government

b. : fitted for operation by either or both of two agents

driving lessons given on dual -control cars

dual -fuel engines that run on oil or oil and gas

II. noun

( -s )

1. : the dual number of a language or a form in it

2. : the result obtained in consequence of interchanging conjunction and alternation throughout a formula in the propositional calculus

3. : a chess problem for which two solutions exist

4. : a pair of dual wheels or dual tires

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.