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someone

pron. · n.
US //ˈsəmˌwən// UK //sˈʌmwɒn// some·one
  1. 1 an unknown person (pron.)
    A1 Beginner

    used to refer to a person when you do not know their name or identity.

    an indefinite pronoun referring to a person of unspecified or unknown identity.

    Example

    Someone left an umbrella in the hallway, but I don't know who it belongs to.

    Example

    If someone calls while I am in the meeting, please take a detailed message and ask for their contact information.

    Pitfall
    Someone are at the door.
    Someone is at the door.

    Even though 'someone' might refer to many people in a general sense, it is grammatically singular and always takes a singular verb.

  2. 2 an important person (n.)
    B2 Upper Intermediate Informal

    a person who is famous, successful, or important.

    a person of significance, social standing, or professional importance.

    Example

    After her book became a bestseller, she felt like she was finally someone.

    Example

    In a town this small, anyone with a steady job and a clean car is considered to be someone.

    Usage

    Often used with the verb 'to be' to indicate a change in status.

Origin

From Middle English sum on, sum one, sum oon, equivalent to some + one.

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