Pre-, [L. prae, adv. & prep., before, akin to pro, and to E. for, prep.: cf. F. pré-. See Pro-, and cf. Prior.].
A prefix denoting priority (of time, place, or rank); as, precede, to go before; precursor, a forerunner; prefix, to fix or place before; preëminent eminent before or above others. Pre- is sometimes used intensively, as in prepotent, very potent. [1913 Webster]