/ əˈnɒnɪməs; NAmE əˈnɑːn-/ adjective
1.
( of a person ) with a name that is not known or that is not made public :
an anonymous donor
The money was donated by a local businessman who wishes to remain anonymous .
2.
( abbr. anon. ) written, given, made, etc. by sb who does not want their name to be known or made public :
an anonymous letter
3.
without any unusual or interesting features :
long stretches of dull and anonymous countryside
► an·onym·ous·ly adverb
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WORD ORIGIN
late 16th cent.: via late Latin from Greek anōnumos nameless (from an- without + onoma name) + -ous .