Definitions
1.nounAn extract; a preparation, now especially one effective against a certain number of strains of a pathogen.
2.nounThe combining capacity of an atom, radical or functional group determined by the number of electrons that it will lose, gain, or share when it combines with other atoms etc.
3.nounThe number of binding sites of a molecule, such as an antibody or antigen.
4.nounThe number of arguments that a verb can have, including its subject, ranging from zero (for the likes of "It rains") to three (for the likes of "He gives her a flower") or, less commonly, four."The number of bonds that a verb has constitutes what we will call the valence of the verb."
5.nounA one-dimensional value assigned to an object, situation, or state, that can usually be positive or negative."anger and fear have negative valence"
6.nounValue.