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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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Word of the Day

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    Idiom of the Day

    on shaky ground
    unstable, not secure
    The man's position at the company has been on shaky ground for a long time.



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