The forces of gravitation, electricity, or chemical affinity are only distinguished from one another in that they are differently defined by reason.
She knew that being thrown together again under such terrible circumstances they would again fall in love with one another, and that Nicholas would then not be able to marry Princess Mary as they would be within the prohibited degrees of affinity.
And as the undefinable essence of the force moving the heavenly bodies, the undefinable essence of the forces of heat and electricity, or of chemical affinity, or of the vital force, forms the content of astronomy, physics, chemistry, botany, zoology, and so on, just in the same way does the force of free will form the content of history.
There are no more uses of "affinity" in the book.
Show samples from other sources
She thinks deeply and has an affinity for others with the same kind of mind.
the Moor replies that he you hurt is of great fame in Cyprus and great affinity
William Shakespeare -- Othello, the Moor of Venice