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Definition of cypher noun from the Oxford Advanced Learner's Dictionary

cypher

noun
 
/ˈsaɪfə(r)/
 
/ˈsaɪfər/
(also cipher)
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  1. [uncountable, countable] a secret way of writing, especially one in which a set of letters or symbols is used to represent others
    • a message in cypher
  2. [countable] (formal, disapproving) a person or thing of no importance
    • To her employers she was a mere cypher, with no human feelings at all.
  3. (British English) the first letters of somebody’s name combined in a design and used to mark things
    • The glasses were engraved with the Queen's cypher.

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