n. Passage from one place, state, or act to another; change: as, a sudden transition from anger to mirth; a state of transition.n. In rhetoric, a passing from one subject to another.n. In music, same (usually) as modulation.n. In geology, the English form of the name (used attributively or as an adjective) given by Werner to certain strata which he investigated in northern Germany, and found to have, to a certain extent, the mineral character of the socalled primitive rocks, while also exhibiting indications of a mechanical origin, and even containing occasional fossils, thus indicating a transition or passage from primary to secondary.n. In art hist., an epoch or stage of change from one style or state of development in art to the next succeeding; especially, in Greek art, the stage of change from the archaic to the bloom of art, and in medieval art, that from the round-arched or Romanesque to the Pointed style.