- (chemistry) The atomic weight of an element or radical divided by its valence; the molecular weight of a compound divided by its combining power in a specific reaction.
1888, Thomas Sterry Hunt, A New Basis for Chemistry, page 149:
- In the proportion d : p :: 1 : v, as applied to any liquid or solid species, p does not represent its real equivalent weight, but the weight of the normal species which, by its condensation, gives rise to the liquid or solid.
1922, Leicester F. Hamilton, Calculations of Analytical Chemistry, page 38:
- The equivalent weight of an element or compound is that weight equivalent in reactive power to one atomic weight of hydrogen.