S: (n) first base, first (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))
S: (n) first gear, first, low gear, low (the lowest forward gear ratio in the gear box of a motor vehicle; used to start a car moving)
Adjective
S: (adj) first (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"
S: (adj) first, 1st (indicating the beginning unit in a series)
S: (adj) inaugural, initiative, initiatory, first, maiden (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"
S: (adj) beginning, first (serving to begin) "the beginning canto of the poem"; "the first verse"
S: (adj) first, foremost, world-class (ranking above all others) "was first in her class"; "the foremost figure among marine artists"; "the top graduate"
S: (adj) first (highest in pitch or chief among parts or voices or instruments or orchestra sections) "first soprano"; "the first violin section"; "played first horn"