: before anything else, most importantly, initially, anything else
n.: first and foremost, first (of all), as a first point, intially, principally, (the)first thing, of all things, for one thing, as [for] a starter, for a start (=start with), by preference, in the first instance, at the first brush, in the first place, above all, beyond all, first of all, at the beginning, at a first brush
v.: begin with, start with, begin
adv.: uppermost, primarily, imprimis, foremost, firstly, first