One (noun) Definition, Meaning & Examples

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adjective
  1. being or amounting to a single unit or individual or entire thing, item, or object rather than two or more; a single: one woman;one nation;one piece of cake.
  2. being a person, thing, or individual instance or member of a number, kind, group, or category indicated: one member of the party.
  3. existing, acting, or considered as a single unit, entity, or individual.
  4. of the same or having a single kind, nature, or condition: We belong to one team.We are of one resolve.
  5. noting some indefinite day or time in the future: You will see him one day.
  6. a certain (often used in naming a person otherwise unknown or undescribed): One John Smith was chosen.
  7. being a particular, unique, or only individual, item, or unit: I'm looking for the one adviser I can trust.
  8. noting some indefinite day or time in the past: We all had dinner together one evening last week.
  9. of no consequence as to the character, outcome, etc.; the same: It's all one to me whether they go or not.
noun
  1. the first and lowest whole number, being a cardinal number; unity.
  2. a symbol of this number, as 1 or I.
  3. a single person or thing: If only problems would come one at a time!
  4. a die face or a domino face having one pip.
  5. a one-dollar bill: to change a five-dollar bill for five ones.
  6. (in Neoplatonism) the ultimate reality, seen as a central source of being by whose emanations all entities, spiritual and corporeal, have their existence, the corporeal ones containing the fewest of the emanations.
pronoun
  1. a person or thing of a number or kind indicated or understood: one of the Elizabethan poets.
  2. (in certain pronominal combinations) a person unless definitely specified otherwise: every one.
  3. (with a defining clause or other qualifying words) a person or a personified being or agency: the evil one;the one I love.
  4. any person indefinitely; anyone: One's score is never as good as one would desire.
  5. (used as a substitute for the pronoun I): Mother had been ailing for many months, and one should have realized it.
  6. a person of the speaker's kind; such as the speaker's own self: to press one's own claims.
  7. something or someone of the kind just mentioned: The portraits are fine ones.Your teachers this semester seem to be good ones.
  8. something available or referred to, especially in the immediate area: Here, take one—they're delicious.The bar is open, so have one on me!
Idioms
  1. at one,
    • in a state of agreement; of one opinion.
    • united in thought or feeling; attuned. He felt at one with his Creator.
  2. everyone: They came, one and all, to welcome him home.
  3. singly and successively: One by one the children married and moved away.
  4. road (def. 10).
  1. a suffix used in the names of ketones and analogous chemical compounds: lactone; quinone.
determiner
    • single; lone; not two or more
    • (as pronoun)
    • (in combination)
    • distinct from all others; only; unique
    • (as pronoun)
    • a specified (person, item, etc) as distinct from another or others of its kind
    • (as pronoun)
  4. a certain, indefinite, or unspecified (time); some
  5. informal an emphatic word for a 1, an 1 it was one hell of a fight
  6. a certain (person)
  7. combined; united
  8. all one
    • all the same
    • of no consequence
  9. in a state of agreement or harmony
  10. (of a man and a woman) to become married
  11. many people
  12. indefinite, undecided, or mixed
  13. none
  14. everyone, without exception
  15. one at a time; individually
  16. a few
  17. on balance
  18. exhibiting bad temper; ranting
  19. on average
pronoun
  1. an indefinite person regarded as typical of every person
  2. any indefinite person: used as the subject of a sentence to form an alternative grammatical construction to that of the passive voice
  3. an unspecified person
noun
  1. the smallest whole number and the first cardinal number; unity
  2. a numeral (1, I, i, etc) representing this number
  3. a joke or story (esp in the one about)
  4. the numeral 1 used as the lower figure in a time signature to indicate that the beat is measured in semibreves
  5. something representing, represented by, or consisting of one unit
  6. one hour after noon or midnight
  7. a blow or setback (esp in the phrase one in the eye for)
  8. (in Neo-Platonic philosophy) the ultimate being
  9. God
  10. Satan; the devil
suffix forming nouns
  1. indicating that a chemical compound is a ketone
    One (noun) Definition, Meaning & Examples

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