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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

    knuckle under
    to yield, to submit
    The union finally knuckled under from the pressure and ended the strike.



    1.
    I walked __________ the street.

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