Meaning of equivalent weight

equiv'alent weight'

Pronunciation: [key]
— Chem. Chem.
  1. the combining power, esp. in gramsof an element or compound, equivalent to hydrogen as a standard of 1.00797 or oxygen as a standard of 8; the atomic weight divided by the valence.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.