(adv.) In the first place; before anything else; -- sometimes improperly used for first.

ab initio aborigine afresh again anew as new at first at the start basal basic before everything chiefly constituent constitutive de novo elemental elementary essential first first and foremost first thing firstly freshly from scratch from the beginning fundamental gut in the beginning initially mainly material new newly of the essence once more original originally primal primarily primary primitive primo principally radical substantial substantive underlying