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
origin
original