adj 1  :  corresponding or virtually identical esp. in effect or function <drugs that are therapeutically >   2  :  having the same chemical combining capacity < quantities of two elements> 
n 1 a  :  the relative weight of an element that has the same combining capacity as a given weight of another element  :  the atomic weight divided by the valence  b  :  the relative weight of a radical or compound that combines with a given weight of an element, radical, or compound : esp  :  the weight of a compound that reacts with one equivalent of a given chemical element  2  :  a psychopathological symptom replacing the usual one in a given disorder <a twilight state may be an epileptic >  .
 
 
 
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