first - definition, thesaurus and related words from WordNet-Online

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Adjective first has 7 senses

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"
Antonyms: last, antepenultimate, endmost, terminal, parting, parthian, penultimate, senior, fourth-year, subterminal, sunset, ultimate, intermediate, gray, grey, halfway, in-between, mediate, middle, junior, third-year, next-to-last, second, sophomore, second-year
first, 1st - indicating the beginning unit in a series
Antonym: cardinal (indirect, via ordinal)
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"
Antonym: closing (indirect, via opening)
beginning, first - serving to begin; "the beginning canto of the poem"; "the first verse"
Antonym: closing (indirect, via opening)
first, foremost, world-class - ranking above all others; "was first in her class"; "the foremost figure among marine artists"; "the top graduate"
Antonym: worst (indirect, via best)
first - highest in pitch or chief among parts or voices or instruments or orchestra sections; "first soprano"; "the first violin section"; "played first horn"
Antonym: second
first, low - being the gear producing the lowest drive speed; "use first gear on steep hills"
Antonym: reverse (indirect, via forward)

Adverbial first has 4 senses

first, firstly, foremost, first of all, first off - before anything else; "first we must consider the garter snake"
first, for the first time - the initial time; "when Felix first saw a garter snake"
first - before another in time, space, or importance; "I was here first"; "let's do this job first"
foremost, first - prominently forward; "he put his best foot foremost"

Noun first has 6 senses

first, number one - the first or highest in an ordering or series; "He wanted to be the first"
--₁ is a kind of rank
--₁ has particulars: former
first, number one, number 1 - the first element in a countable series; "the first of the month"
--₂ is a kind of ordinal number, ordinal, no.
beginning, commencement, first, outset, get-go, start, kickoff, starting time, showtime, offset - 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"
--₃ is a kind of point, point in time
--₃ has particulars:
birth; incipiency, incipience; terminus a quo, starting point; threshold
first base, first - the fielding position of the player on a baseball team who is stationed at first base
--₄ is a kind of position
--₄ is a member of baseball team
first, first-class honours degree - an honours degree of the highest class
--₅ is a kind of honours, honours degree
--₅ has particulars: double first
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
--₆ is a kind of gear, gear mechanism
--₆ is a part of car, auto, automobile, machine, motorcar