anonymity - definition and synonyms

noun [uncountable] 

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/ˌænəˈnɪməti/
  1. 1
    a situation in which the name of a person who does something such as write a book or give information is not known or is kept secret

    The informant spoke on condition of anonymity (=in return for his name not being mentioned).

    the bustle and anonymity of a big city (=where people do not know each other)