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valence

n.
1.(biology) a relative capacity to unite or react or interact as with antigens or a biological substrate
2.(chemistry) a property of atoms or radicals

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    Idiom of the Day

    get-up-and-go
    energy, enthusiasm, drive
    The man has lots of get-up-and-go and it is difficult to follow him around.



    1.
    The ________ of our expedition was still so far away that I felt we would never get there.

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