(n) the fielding position of the player on a baseball team who is stationed at first base
(n) the lowest forward gear ratio in the gear box of a motor vehicle; used to start a car moving
(n) an honours degree of the highest class
(n) the first element in a countable series; "the first of the month"
(n) the first or highest in an ordering or series; "He wanted to be the first"
(n) the time at which something is supposed to begin; "they got an early start"; "she knew from the get-go that he was the man for her"
(s) being the gear producing the lowest drive speed; "use first gear on steep hills"
(s) ranking above all others; "was first in her class"; "the foremost figure among marine artists"; "the top graduate"
(s) serving to begin; "the beginning canto of the poem"; "the first verse"
(s) serving to set in motion; "the magazine's inaugural issue"; "the initiative phase in the negotiations"; "an initiatory step toward a treaty"; "his first (or maiden) speech in Congress"; "the liner's maiden voyage"
(a) preceding all others in time or space or degree; "the first house on the right"; "the first day of spring"; "his first political race"; "her first baby"; "the first time"; "the first meetings of the new party"; "the first phase of his training"
(a) highest in pitch or chief among parts or voices or instruments or orchestra sections; "first soprano"; "the first violin section"; "played first horn"
(s) indicating the beginning unit in a series
(r) before anything else; "first we must consider the garter snake"
(r) the initial time; "when Felix first saw a garter snake"
(r) prominently forward; "he put his best foot foremost"
(r) before another in time, space, or importance; "I was here first"; "let's do this job first"