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Definitions of dual

  1. consisting of or involving two parts or components usually in pairs; "an egg with a double yolk"; "a double (binary) star"; "double doors"; "dual controls for pilot and copilot"; "duple (or double) time consists of two (or a multiple of two) beats to a measure" Wordnet Dictionary DB
  2. having more than one decidedly dissimilar aspects or qualities; "a double (or dual) role for an actor"; "the office of a clergyman is twofold; public preaching and private influence"- R.W.Emerson; "every episode has its double and treble meaning"-Frederick Harrison Wordnet Dictionary DB
  3. a grammatical number category referring to two items or units (as opposed to one item (singular) or more than one item (plural)); "ancient Greek had the dual form but it has merged with the plural form in modern Greek" Scrapingweb Dictionary DB
  4. a grammatical number category referring to two items or units as opposed to one item (singular) or more than two items (plural); "ancient Greek had the dual form but it has merged with the plural form in modern Greek" Wordnet Dictionary DB
  5. Expressing, or consisting of, the number two; belonging to two; as, the dual number of nouns, etc. , in Greek. Webster Dictionary DB
  6. Expressing or composed of the number two. The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919.
  7. The form of the noun or verb meaning two persons or things. The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919.
  8. Consisting of two. Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
  9. Denoting or relating to two; twofold. The Concise Standard Dictionary of the English Language. By James Champlin Fernald. Published 1919.
  10. Dualistic. The Concise Standard Dictionary of the English Language. By James Champlin Fernald. Published 1919.
  11. Expressing the number two. Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
  12. Every field of mathematics has a differentmeaning of dual. Loosely, where there is some binary symmetryof a theory, the image of what you look at normally under thissymmetry is referred to as the dual of your normal things.In linear algebra for example, for any vector space V, overa field, F, the vector space of linear maps from V to F isknown as the dual of V. It can be shown that if V isfinite-dimensional, V and its dual are isomorphic (though noisomorphism between them is any more natural than any other).There is a natural embedding of any vector space in the dualof its dual: V -> V'': v -> (V': w -> wv : F) (x' is normally written as x with a horizontal bar above it).I.e. v'' is the linear map, from V' to F, which maps any w tothe scalar obtained by applying w to v. In short, thisdouble-dual mapping simply exchanges the roles of function andargument.It is conventional, when talking about vectors in V, to referto the members of V' as covectors. foldoc_fs
  13. d[=u]'al, adj. consisting of two.--ns. D[=U]'AD, a pair of objects looked at as one; D[=U]'AL-CONTROL', any joint control or jurisdiction, as of England and France in Egypt; D[=U]'ALISM (philos.), that view which seeks to explain the world by the assumption of two radically independent and absolute elements--e.g. (1) the doctrine of the entire separation of spirit and matter, thus being opposed both to idealism and to materialism; (2) the doctrine of two distinct principles of good and of evil, or of two distinct divine beings of these characters; D[=U]'ALIST, a believer in dualism.--adj. DUALIS'TIC, consisting of two: relating to dualism.--ns. DUAL'ITY, doubleness: state of being double; D[=U]'AL-SCHOOL, a school for both boys and girls; D[=U]'ARCHY, government by two. [L.,--duo, two.] gutenberg.org/ebooks/37683
  14. Of two, twofold, divided in two, double, (d. ownership, skirl); (Gram.) d. number or d., inflected form proper to two persons or things (additional to singular& plural). So duality n., dualize (3) v.t., dually adv. [Latin] Concise Oxford Dictionary
  15. the D. Monarchy, Austria-Hungary. Concise Oxford Dictionary

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