Originally

1. (adv.) In the original time, or in an original manner; primarily; from the beginning or origin; not by derivation, or imitation.

2. (adv.) At first; at the origin; at the time of formation or construction; as, a book originally written by another hand.

Thesaurus Entries

ab initio, ab ovo, aborigine, at first, at the start, before everything, by birth, by nature, chiefly, congenitally, first, first and foremost, first thing, firstly, from the beginning, genetically, immanently, in the beginning, initially, innately, internally, intrinsically, inwardly, mainly, naturally, primally, primarily, primitively, primo, principally