in the beginning

early

aboriginal antecedent anterior basic beginning cardinal front fundamental head inaugural initial key leading opening original pioneer premier primary prime primitive

elementary first off headmost inceptive incipient introductory lead off number one numero uno primeval primogenial primordial pristine right up front rudimentary

last

ending extra final following second

basically formerly

primitively

at first at the outset at the start by birth by origin first in the first place incipiently primarily to begin with

secondarily