fluxion

Newton’s style of differentiation was based upon fluxions—the flows—of mathematical expressions that he called fluents.

It would be of particular interest to determine whether the torment of this tissue in any way interfered with the augmentation of bilious fluxion.

It should hardly be offensive to an ordinary man to be told, or at least to find it tacitly assumed, that he could not have invented fluxions, painted like Rembrandt, or sung like Pindar.

Though he experienced some difficulty at his first entrance, yet he did not rest till he made himself master of both a fluxion and a flowing quantity.

Newton's discovery of the law of gravitation, and his theory of fluxions place him at the head of the mathematical thinkers of the world.