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 Now typically superseded by more precise terms such as hydrogen interaction

Hydrogen bond

A hydrogen bond is the attractive interaction of a hydrogen atom with an electronegative atom, such as nitrogen, oxygen or fluorine, that comes from another molecule or chemical group. The hydrogen must be covalently bonded to another electronegative atom to create the bond...

.

Philosophy

Chemism is a term in Hegelian philosophy

Hegelianism

Hegelianism is a collective term for schools of thought following or referring to G. W. F. Hegel's philosophy which can be summed up by the dictum that "the rational alone is real", which means that all reality is capable of being expressed in rational categories...

 for the "mutual attraction, interpenetration, and neutralisation of independent individuals which unite to form a whole."
In his Science of Logic, Georg Wilhelm Friedrich Hegel

Georg Wilhelm Friedrich Hegel

Georg Wilhelm Friedrich Hegel was a German philosopher, one of the creators of German Idealism. His historicist and idealist account of reality as a whole revolutionized European philosophy and was an important precursor to Continental philosophy and Marxism.Hegel developed a comprehensive...

wrote:

"Chemism constitutes in objectivity as a whole, the moment of judgment, of the difference that has become objective, and of the process. Since it already begins with determinateness and positedness and the chemical object is at the same time an objective totality, its immediate course is simple and is completely determined by its presupposition."

The use of the term in philosophy references the activities of chemism in chemistry.