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Stedman's Medical Dictionary
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Stedman's > equivalence

equivalence

Pronunciation: ē-kwiv′ă-lens, -len-sē
  1. The property of an element or radical of combining with or displacing, in definite and fixed proportion, another element or radical in a compound.
  2. The point in a precipitin test at which antibody and antigen are present in optimal proportions.

[L. aequus, equal, + valentia, strength (valence)]