digit - definition and synonyms

noun [countable] 

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/ˈdɪdʒɪt/
singulardigit
pluraldigits
  1. 1
    formal one of the written numbers from 0 to 9
    five-digit/eight-digit etc (=a number consisting of five/eight numbers):

    You will be given a nine-digit account number.

  2. 2
    medical one of your fingers or toes