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Definition

  1. Cardinal number:

    • The number or figure 1; the lowest cardinal number, representing a single unit or thing. It is the first and smallest positive integer.
    • Used to refer to a single person or thing, often to emphasize singularity or uniqueness.

  2. Pronoun:

    • Used to refer to a person or thing previously mentioned or easily identified.
    • Used more generally to refer to people in general, including the speaker.

  3. Adjective:

    • Referring to a single person or thing.
    • Used for emphasis to mean "the only" or "a particular."
    • Denoting a particular but unspecified item in a sequence.
Usage and Examples
  • As a cardinal number:
    • There is only one cookie left in the jar.
    • The answer to the first question is one.
  • As a pronoun:
    • I need a pen. Do you have one?
    • One should always tell the truth. (formal/general)
  • As an adjective:
    • She has one brother.
    • That's the one thing I cannot accept.
Advanced Usage
  • "The one and only": Used for emphasis to describe someone or something famous and unique.
    • Please welcome, the one and only Elvis Presley!
  • "At one": In a state of agreement or harmony.
    • After their discussion, they were at one on the issue.
  • "For one": As one example (often used to introduce an opinion).
    • I, for one, think it's a brilliant idea.
Variants and Related Words
  • Once (adverb): One single time.
    • I've only been to Paris once.
  • Oneness (noun): The state of being unified or whole.
    • The meditation focused on a feeling of oneness with nature.
  • One-off (noun/adjective, British English): Something that happens or is made only once.
    • The concert was a one-off event.
Synonyms
  • Single: Consisting of one part or aspect.
    • A single rose.
  • Sole: Being the only one.
    • The sole survivor.
  • Unit: An individual thing or person regarded as single and complete.
    • The apartment building has 20 units.
Related Phrases and Idioms
  • One by one: Separately and in sequence.
    • The students entered the room one by one.
  • Back to square one: Forced to start over because of a failure.
    • The experiment failed, so we're back to square one.
  • Kill two birds with one stone: To achieve two aims with a single action.
    • By taking the train, I save money and see the countryside—killing two birds with one stone.
Adjective
  1. used of a single unit or thing; not two or more
    • `ane' is Scottish
Noun
  1. 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

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