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afternoon

US //ˌæftɝˈnun// af·ter·noon
  1. 1 time of day (n.)
    A1 Beginner

    the part of the day from 12:00 (noon) until the early evening.

    the period from noon (12:00) until the beginning of evening — a relational boundary, not a fixed clock time, since "evening" itself depends on culture and season (often 5:00–6:00 PM by social convention).

    Example

    We spent the whole afternoon walking through the park and talking.

    Example

    The heavy rain persisted throughout the afternoon, forcing the organisers to relocate the outdoor ceremony to the main hall.

    Pitfall
    I will see you on the afternoon.
    I will see you in the afternoon.

    Use the preposition 'in' with 'afternoon' when referring to the time of day.

  2. 2 later stage (n.)
    C1 Advanced Literary

    the later part of something, like a person's life or a long event.

    the final or declining stage of a period of time, a career, or a lifespan.

    Example

    In the afternoon of his life, the old man enjoyed sitting in his garden.

    Example

    The empire entered its long afternoon, characterized by a slow decay of its once-mighty institutions and a loss of territorial control.

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  1. 3 social event (n.)
    B2 Upper Intermediate British English

    a party or meeting that happens during the afternoon.

    a social gathering or formal event scheduled during the afternoon hours.

    Example

    The local club is hosting a musical afternoon for the neighborhood families.

    Example

    The charity organized a literary afternoon, featuring readings from local poets and a silent auction to raise funds for the library.

Origin

From Middle English afternone, after-non, equivalent to after- + noon.

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