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cypher

[sahy-fer]
noun, verb (used with or without object) Chiefly British.
  1. cipher.
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cipher

[sahy-fer]
noun
  1. zero.
  2. any of the Arabic numerals or figures.
  3. Arabic numerical notation collectively.
  4. something of no value or importance.
  5. a person of no influence; nonentity.
  6. a secret method of writing, as by transposition or substitution of letters, specially formed symbols, or the like.Compare cryptography.
  7. writing done by such a method; a coded message.
  8. the key to a secret method of writing.
  9. a combination of letters, as the initials of a name, in one design; monogram.
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verb (used without object)
  1. to use figures or numerals arithmetically.
  2. to write in or as in cipher.
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verb (used with object)
  1. to calculate numerically; figure.
  2. to convert into cipher.
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Also especially British, cy·pher.

Origin of cipher

1350–1400; Middle English siphre < Medieval Latin ciphra < Arabic ṣifr empty, zero; translation of Sanskrit śūnyā empty
Related formsci·pher·a·ble, adjectiveci·pher·er, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for cypher

cypher

noun, verb
  1. a variant spelling of cipher
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cipher

cypher

noun
  1. a method of secret writing using substitution or transposition of letters according to a key
  2. a secret message
  3. the key to a secret message
  4. an obsolete name for zero (def. 1)
  5. any of the Arabic numerals (0, 1, 2, 3, etc, to 9) or the Arabic system of numbering as a whole
  6. a person or thing of no importance; nonentity
  7. a design consisting of interwoven letters; monogram
  8. music a defect in an organ resulting in the continuous sounding of a pipe, the key of which has not been depressed
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verb
  1. to put (a message) into secret writing
  2. (intr) (of an organ pipe) to sound without having the appropriate key depressed
  3. rare to perform (a calculation) arithmetically
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Word Origin

C14: from Old French cifre zero, from Medieval Latin cifra, from Arabic sifr zero, empty
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for cypher

cipher

n.

late 14c., "arithmetical symbol for zero," from Old French cifre "nought, zero," Medieval Latin cifra, with Spanish and Italian cifra, ultimately from Arabic sifr "zero," literally "empty, nothing," from safara "to be empty;" loan-translation of Sanskrit sunya-s "empty." The word came to Europe with Arabic numerals. Originally in English "zero," then "any numeral" (early 15c.), then (first in French and Italian) "secret way of writing; coded message" (a sense first attested in English 1520s), because early codes often substituted numbers for letters. Klein says Modern French chiffre is from Italian cifra.

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cipher

v.

"to do arithmetic" (with Arabic numerals), 1520s, from cipher (n.). Meaning "to write in code" is from 1560s. Related: Ciphered; ciphering.

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Online Etymology Dictionary, © 2010 Douglas Harper