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duality

n.
1.being twofold
2.(physics) the property of matter and electromagnetic radiation that is characterized by the fact that some properties can be explained best by wave theory and others by particle theory
3.(geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry

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    Idiom of the Day

    at loose ends
    restless and unsettled
    My friend's mother was at loose ends after her husband died.



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