Pronunciation: e-kwiv'a-lens, -len-se
- The property of an element or radical of combining with or displacing, in definite and fixed proportion, another element or radical in a compound.
- The point in a precipitin test at which antibody and antigen are present in optimal proportions.
[L. aequus, equal, + valentia, strength (valence)]
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Examples: glitazone, GI cocktail, etc.