Synonyms for First:

adj.

beginning (adjective)
aboriginal, alpha, baby, beginning, budding, early, embryonic, emerging, fetal, foremost, formative, genesis, germinal, hatching, inaugural, incipient, infant, infantile, initial, introductory, maiden, nascent, new, newborn, original, precursory, preliminary, preparatory, primal, primeval, primordial, sprouting, starting, Dawned, Commencing, initiatory, Inceptive.
earliest (adjective)
maiden, original, primordial.
earliest in order (adjective)
aboriginal, antecedent, anterior, basic, beginning, cardinal, early, first off, front, head, inaugural, incipient, initial, introductory, key, leading, number one, opening, original, pioneer, premier, primary, prime, primeval, primordial, rudimentary, Inceptive.
final (adjective)
last.
highest in importance (adjective)
chief, foremost, main, paramount, preeminent, principal.
older (adjective)
firstborn.
original (adjective)
authentic, creative, genuine, ingenious, innovative, novel, prototypical, unique, initial, original.

adv.

all (adverb)
first of all, first off, firstly, foremost.
at the beginning (adverb)
initially, to begin with.

adv

at first (adverb)
initially.
firstly (adverb)
initially, to begin with, at first under first.
originally (adverb)
at first, to begin with.

n.

aa, antecedent, anterior, associate, associate degree, ba, baccalaureate, bachelor's degree, earliest, front, head, last, leading, primary, rudimentary, ultimate, Inceptive, 21, 22, advanced degree, Associate of Arts. basically, chief, essentially, importantly, in essence, mainly, preeminent, principal, at the end of the day, not just any..., the fact (of the matter) is. advance, barely, before, earlier, pioneer, previous, Since, by the time. affront, blow, capital, cardinal, important, key, main, major, paramount, revelation, scandal, shock, surprise, zinger, a blinding revelation/realization/vision, a first, a rude awakening. all along, at first, front end, from the get-go. author, creator, engineer, inventor, originator, progenitor, visionary, creative commons. auto, automobile, defrost, body shop, car wash, jump leads, jumper cables, lube job, the AAA. first-rate, ideal, incomparable, par excellence, unsurpassed, first class, second to none, there is no substitute for something. beginning (noun)
alpha.
communication (noun)
First-class Honours Degree.
first (noun)
archetypal, archetypical, basic, beginning, best, commencement, eldest, first base, first gear, first of all, first off, First-class Honours Degree, first-year, firstborn, firstly, for the first time, foremost, forward, freshman, inaugural, initial, initiative, initiatory, introductory, kickoff, low, low gear, maiden, number 1, number one, offset, oldest, opening, ordinal, original, outset, premier, premiere, prime, prototypal, prototypic, prototypical, start, starting time, top, 1st.
linkdef (noun)
number one.
opening (noun)
kickoff.

Other synonyms:

auto, automobile, barely, basically, best, defrost, earlier, earliest, front, importantly, previous, principal, Since, body shop, car wash, jump leads, jumper cables, lube job, the AAA. before, key, main, paramount, top. major. prime. advance. earliest
primary.
first
leading.
first-class honours degree
First-class Honours Degree.
principal
capital.
Other relevant words:
advance, antecedent, anterior, archetypal, archetypical, at first, auto, automobile, basic, basically, before, best, capital, cardinal, chief, commencement, defrost, earlier, earliest, eldest, first base, first gear, first of all, first off, First-class Honours Degree, first-year, firstborn, firstly, for the first time, forward, freshman, front, head, important, incomparable, initially, initiative, initiatory, key, kickoff, leading, low, low gear, main, mainly, major, number 1, number one, offset, oldest, opening, ordinal, outset, paramount, pioneer, preeminent, premier, premiere, previous, primary, prime, principal, prototypal, prototypic, rudimentary, start, starting time, to begin with, top, ultimate, unsurpassed, Inceptive, first class, 1st.

Usage examples for first

  1. 6306. When did you hear about it first – Second Shetland Truck System Report by William Guthrie
  2. I got him first that's all. – They of the High Trails by Hamlin Garland
  3. But first you must take this- and then you must talk to me. – Marcella by Mrs. Humphry Ward