1) Chemical action 
Chemism refers to forces of attraction or adhesion between entities. It has uses in chemistry and philosophy. ==Chemistry== In the past, chemism referred to intramolecular forces between atoms, or more generally, any forces acting on atoms and molecules. Now typically superseded by more precise terms such as hydrogen interaction. ==Philosophy== Th...
• (n.) The force exerted between the atoms of elementary substance whereby they unite to form chemical compounds; chemical attaction; affinity; -- sometimes used as a general expression for chemical activity or relationship.
Chem'ism noun [ Confer French chimisme . See Chemistry .] The force exerted between the atoms of elementary substance whereby they unite to form chemical compounds; chemical attaction; affinity; -- sometimes used as a general expression for chemical activity or relationship. 
chemism 1. Chemical activity. 2. A chemical property or relationship.
chemical action.