Mayer took the fourth step by showing that the force which enters into the constitution of the universe is an eternality.
It destroys on the one hand the idea of the eternality of economic laws and limits them to particular epochs.
Lavoisier took the third step by showing that the matter which enters into the constitution of the universe is an eternality.
late 14c., from Old French eternel or directly from Late Latin aeternalis, from Latin aeternus "of an age, lasting, enduring, permanent, endless," contraction of aeviternus "of great age," from aevum "age" (see eon). Related: Eternally.