• (RP) IPA: /wʌn/, [wɐn]
  • (Australia) IPA: /wan/, [wän]
  • (British) IPA: /wɒn/
  • (America) enPR: wŭn, IPA: /wʌn/
  • (obsolete) enPR: ōn, IPA: /oʊn/
  1. cln en The number represented by the Arabic numeral 1; the numerical value equal to that cardinal number.
    In some religions, there is only one god.
    In many cultures, a baby turns one year old a year after its birth.
    One person, one vote.
    • 1912 January, Zane Grey, chapter 8, in Riders of the Purple Sage: A Novel, New York, N.Y.; London: Harper & Brothers Publishers, OCLC 6868219 ↗:
      Venters began to count them—one—two—three—four—on up to sixteen.
  2. (number theory) The first positive number in the set of natural numbers.
  3. (set theory) The cardinality of the smallest nonempty set.
  4. (mathematics) The ordinality of an element which has no predecessor, usually called first or number one.
Related terms Pronoun
  1. (impersonal pronoun, indefinite) One thing (among a group of others); one member of a group.
    The big one looks good.  I want the green one.  A good driver is one who drives carefully.
    • 1609, William Shakespeare, “Sonnet 6”, in Shake-speares Sonnets. Neuer before Imprinted, London: By G[eorge] Eld for T[homas] T[horpe] and are to be sold by William Aspley, OCLC 216596634 ↗:
      Which happies thoſe that pay the willing loan#English|lone; / That's for thy ſelfe to breed an other thee / Or ten times happier be it ten for one,{{...}
  2. (impersonal pronoun, sometimes with "the") The first mentioned of two things or people, as opposed to the other.
    She offered him an apple and an orange; he took one and left the other.
    • 1699, Sir William Temple, 1st Baronet, Heads designed for an essay on conversations ↗
      Study gives strength to the mind; conversation, grace: the first apt to give stiffness, the other suppleness: one gives substance and form to the statue, the other polishes it.
  3. (indefinite personal pronoun) Any person (applying to people in general).
    One’s guilt may trouble one, but it is best not to let oneself be troubled by things which cannot be changed.  One shouldn’t be too quick to judge.
    • 1879, R[ichard] J[efferies], chapter 1, in The Amateur Poacher, London: Smith, Elder, & Co., […], OCLC 752825175 ↗:
      It was not far from the house; but the ground sank into a depression there, and the ridge of it behind shut out everything except just the roof of the tallest hayrick. As one sat on the sward behind the elm, with the back turned on the rick and nothing in front but the tall elms and the oaks in the other hedge, it was quite easy to fancy it the verge of the prairie with the backwoods close by.
    • 1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, New York, N.Y.: Columbia University Press, →ISBN, page vii:
      With fresh material, taxonomic conclusions are leavened by recognition that the material examined reflects the site it occupied; a herbarium packet gives one only a small fraction of the data desirable for sound conclusions. Herbarium material does not, indeed, allow one to extrapolate safely: what you see is what you get […].
  4. (pronoun) Any person, entity or thing.
    "driver", noun: one who drives.
  • (unidentified person) you, they (in nominative personal case)
Translations Translations
  • French: on, quelqu’un
  • German: man, einer
  • Russian: челове́к
  • Spanish: uno, se

one (plural ones)

  1. The digit or figure 1.
  2. (mathematics) The neutral element with respect to multiplication in a ring#Etymology_3|ring.
  3. (US) A one-dollar bill.
  4. (cricket) One run scored by hitting the ball and running between the wickets; a single.
  5. A joke or amusing anecdote.
    Did you hear the one about the agnostic dyslexic insomniac?
  6. (colloquial) A particularly special or compatible person or thing.
    I knew as soon I met him that John was the one for me and we were married within a month.
    That car's the one — I'll buy it.
    • 1995, Bryan Adams, Have You Ever Really Loved a Woman?
      When you love a woman then tell her / that she's really wanted / When you love a woman then tell her that she's the one / 'cause she needs somebody to tell her / that it's gonna last forever
  7. (Internet slang, leet, sarcastic) Used instead of ! to amplify an exclamation, parodying unskilled typists who forget to press the shift key while typing exclamation points, thus typing "1".
    A: SUM1 Hl3p ME im alwyz L0ziN!1!?1!
    Someone help me; I'm always losing!
    B: y d0nt u just g0 away l0zer!!1!!one!!one!!eleven!!1!
    Why don't you just go away loser!!!!!!!!!!!!!!!!!
    • 2003 September 26, "DEAL WITH IT!!!!11one!!", in, Usenet
    • 2004 November 9, "AWK sound recorder!!!11!!11one", in comp.lang.awk, Usenet
    • 2007 December 1, "STANFORD!!1!!1!one!11!!1oneone!1!1!", in, Usenet
  • (mathematics: multiplicative identity) unity
  • (US: one-dollar bill) single
  • (sarcastic substitution for !) 1, eleven
  • Russian: едини́ца
  • French: un
  • German: Eins
  • Italian: uno
  • Portuguese: um
  • Russian: едини́ца
  • Spanish: uno
  • French: billet d’un dollar
  • Italian: biglietto di un dollaro

one (not comparable)

  1. Of a period of time, being particular.
    One day the prince set forth to kill the dragon that had brought terror to his father’s kingdom for centuries.
  2. Being a single, unspecified thing; a; any.
    My aunt used to say, "One day is just like the other."
  3. Sole, only.
    He is the one man who can help you.
  4. Whole, entire.
    Body and soul are not separate; they are one.
  5. In agreement.
    We are one on the importance of learning.
  6. The same.
    The two types look very different, but are one species.
  7. Being a preeminent example.
    He is one hell of a guy.
  8. Being an unknown person with the specified name; see also "a certain#Adjective|certain".
    The town records from 1843 showed the overnight incarceration of one “A. Lincoln”.
Translations Translations Translations Translations Translations
  • Italian: un
  • French: un certain
  • German: ein gewisser, eine gewisse
  • Italian: un certo, un tale

one (ones, present participle oning; past and past participle oned)

  1. To cause to become one; to gather into a single whole; to unite.
    • The rich folk that embraced and oned all their heart to treasure of the world.

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