firstly

• "first we must consider the garter snake"

Synonyms

• firstbefore anything else; the initial time; before another in time, space, or importance; prominently forward; the first or highest in an ordering or series; the first element in a countable series; the time at which something is supposed to begin; the fielding position of the player on a baseball team who is stationed at first of the bases in the infield (counting counterclockwise from home plate) ; an honours degree of the highest class ; the lowest forward gear ratio in the gear box of a motor vehicle; preceding all others in time or space or degree; indicating the beginning unit in a series ; serving to set in motion; serving to begin; ranking above all others; highest in pitch or chief among parts or voices or instruments or orchestra sections
• foremostprominently forward; before anything else; ranking above all others; preceding all others in spatial position; situated closest to the bow
• first of allbefore anything else
• first offbefore anything else