WordReference Random House Learner's Dictionary of American English © 2015
one /wʌn/USA pronunciation adj. 
    [before a noun]
  1. being or amounting to a single unit or individual or entire thing;
    equal to the number 1:one child; only one piece of cake left.
  2. being an individual instance, example, or member of a number, kind, or group indicated:one member of the team.
  3. of the same or having a single kind, nature, or condition:We are of one mind.
  4. (used to refer to an unspecified or imprecise day or time):one evening last week.
  5. [before a proper noun or name] (used to name a person otherwise unknown or not yet described):One John Smith was chosen.
  6. [before a singular countable noun] being a particular or only individual, item, or unit:She's the one person I can trust.
  7. (used to show strong feeling about the noun or adjective that follows) a or an:That is one smart dog.

n. [countable]
  • the first and lowest whole number, being a cardinal number; a unit:Ten minus nine leaves one.
  • a symbol of this number, as 1 or I.
  • a single person or thing:Let's do one at a time.
  • a one-dollar bill.

  • pron. 
  • (used to stand for a person or thing of a number or kind that is about to be indicated):He is one of the Elizabethan poets.
  • (used to stand for a person or thing that has just been mentioned or indicated, or is already understood from the context):The portraits are good ones.
  • a person, or a personified being:Satan, the evil one.
  • any person or thing; people in general:One shouldn't cry over spilled milk (= People in general, including the speaker, shouldn't get upset about things that can't be fixed.)
  • idiom
    1. all one, the same:You can stay or go; it's all one to me. (= It doesn't matter to me which action you take.)
    2. as one: 
      • with complete agreement;
        unanimously:They voted as one.
      • all at the same time; in unison:We rose to our feet as one.
      at one: 
      • united in thought or feeling;
        attuned:to feel at one with the world.
    3. Idiomsone and all, everyone.
    4. Idiomsone by one, singly and following after another.

    Collins Concise English Dictionary © HarperCollins Publishers::

    one /wʌn/ determiner
    1. single; lone; not two or more
    2. (as pronoun): one is enough for now, one at a time
    3. (in combination): one-eyed, one-legged
    4. distinct from all others; only; unique: one girl in a million
    5. (as pronoun): one of a kind
    6. a specified (person, item, etc) as distinct from another or others of its kind: raise one hand and then the other
    7. (as pronoun): which one is correct?
    8. a certain, indefinite, or unspecified (time); some: one day you'll be sorry
    9. informal
      an emphatic word for a, an1: it was one hell of a fight
    10. a certain (person): one Miss Jones was named
    11. in one, all in onecombined; united
    12. all oneall the same
    13. of no consequence: it's all one to me
    14. at one ⇒ (often followed by with) in a state of agreement or harmony
    15. be made one(of a man and a woman) to become married
    16. many a onemany people
    17. neither one thing nor the otherindefinite, undecided, or mixed
    18. never a onenone
    19. one and alleveryone, without exception
    20. one by oneone at a time; individually
    21. one or twoa few
    22. one way and anotheron balance
    23. one with anotheron average
    1. an indefinite person regarded as typical of every person: one can't say any more than that
    2. any indefinite person: used as the subject of a sentence to form an alternative grammatical construction to that of the passive voice: one can catch fine trout in this stream
    3. archaic an unspecified person: one came to him
    1. the smallest whole number and the first cardinal number; unity
    2. a numeral (1, I, i, etc) representing this number
    3. informal a joke or story (esp in the one about)
    4. something representing, represented by, or consisting of one unit
    5. Also called: one o'clock one hour after noon or midnight
    6. a blow or setback (esp in the phrase one in the eye for)
    7. the Holy One, the One aboveGod
    8. the Evil OneSatan; the devil
    Related prefixes: mono-, uni-
    Etymology: Old English ān, related to Old French ān, ēn, Old High German ein, Old Norse einn, Latin unus, Greek oinē ace

    'one' also found in these entries:

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