Definition of cipher noun from the Oxford Advanced American Dictionary

     

    cipher

     noun
    (also cypher)noun
    NAmE//ˈsaɪfər//
     
     
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  1. 1[uncountable, countable] a secret way of writing, especially one in which a set of letters or symbols is used to represent others synonym code a message in cipher see also decipher
  2. 2[countable] (formal) (disapproving) a person or thing of no importance To her employers she was a mere cipher, with no human feelings at all.
See the Oxford Advanced Learner's Dictionary entry: cipher