One refers to a single person or thing, as well as the number one. If you’re looking for a whole number between zero and two, you can only find one.

One is all alone, but it at least it gets to be the first in line. It also gets to be the one and only, far and away the best, and one of a kind. If something (or someone) is "the one" you’ve been looking for, it’s exactly what you want. Sometimes one actually refers to more than one person being united in some way; if you and your friend are of "one mind," you think alike about something.

Definitions of one
  1. noun
    the smallest whole number or a numeral representing this number
    “he has the one but will need a two and three to go with it”
    “they had lunch at one
    synonyms: 1, I, ace, single, unity
    see moresee less
    monad, monas
    a singular metaphysical entity from which material properties are said to derive
    a single object (as distinguished from a pair)
    fellow, mate
    one of a pair
    type of:
    digit, figure
    one of the elements that collectively form a system of numeration
  2. noun
    a single person or thing
    “he is the best one
    “this is the one I ordered”
    see moresee less
    type of:
    a single undivided whole
  3. adjective
    used of a single unit or thing; not two or more
    synonyms: 1, ane, i
    being or denoting a numerical quantity but not order
  4. adjective
    having the indivisible character of a unit
    “spoke with one voice”
    synonyms: unitary
    characterized by unity; being or joined into a single entity
  5. adjective
    of the same kind or quality
    “two animals of one species”
    closely similar or comparable in kind or quality or quantity or degree
  6. adjective
    being a single entity made by combining separate components
    “three chemicals combining into one solution”
    made or joined or united into one
  7. adjective
    used informally as an intensifier
    “that is one fine dog”
    beyond what is ordinary or usual; highly unusual or exceptional or remarkable
  8. adjective
    eminent beyond or above comparison
    “she's one girl in a million”
    “the one and only Muhammad Ali”
    synonyms: matchless, nonpareil, one and only, peerless, unmatchable, unmatched, unrivaled, unrivalled
    incomparable, uncomparable
    such that comparison is impossible; unsuitable for comparison or lacking features that can be compared
  9. adjective
    indefinite in time or position
    “he will come one day”
    one place or another”
    vague or not clearly defined or stated
Word Family
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