quantivalence

from The Century Dictionary.

• noun In chem., the combining power or value of an atom as compared with that of the hydrogen atom, which is taken as the unit of measure: same as valence. Also called atomicity.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Chem.), Archaic Valence.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun chemistry Valence; the atomic or combining power of an element or radical expressed in terms of the number of atoms of hydrogen with which it will unite.