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Synonyms
ci·pher,
also cy·pher (sī́fər)

[Middle English cifre, from Old French, from Medieval Latin cifra, from Arabic ṣifr, from ṣafira, to be empty (translation of Sanskrit śūnyam, cipher, dot).]

noun 

  1. The mathematical symbol (0) denoting absence of quantity; zero.
  2. An Arabic numeral or figure; a number.
  3. One having no influence or value; a nonentity.
    1. A cryptographic system in which units of plain text of regular length, usually letters, are arbitrarily transposed or substituted according to a predetermined code.
    2. The key to such a system.
    3. A message written or transmitted in such a system.
  5. A design combining or interweaving letters or initials; a monogram.

verb: -phered, also -phered, -pher·ing, -pher·ing, -phers, -phers 

intransitive verb 

To solve problems in arithmetic; calculate. See synonyms at calculate

transitive verb 

  1. To put in secret writing; encode.
  2. To solve by means of arithmetic.