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

cipher

noun
 
/ˈsaɪfə(r)/
 
/ˈsaɪfər/
(also cypher)
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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 synonym code
    • a message in cipher
    see also decipher
  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.
  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 cipher.
  4. Word Originlate Middle English (in the senses ‘symbol for zero’ and ‘Arabic numeral’): from Old French cifre, based on Arabic ṣifr ‘zero’.
See cipher in the Oxford Advanced American Dictionary

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