reminder - definition and synonyms

noun [countable] [usually singular] 

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  1. 1
    something that reminds you of something that happened in the past
    reminder of:

    His presence was a constant reminder of what she had lost.

    serve/act as a reminder:

    The cold served as a reminder that winter wasn’t quite finished.

  2. 2
    a letter or note that reminds you of something that you need to do or need to remember

    If an instalment is not paid, a reminder is issued.

    This is just a reminder to let you know that Stefan’s arriving on Saturday.