- The definition of a cipher is the symbol "0" meaning zero, or a secret code, something written in code, or a key used to figure out the meaning of something written in code.
- The symbol "0" entered on a form to show a zero quantity is an example of a cipher.
- When kids make up their own symbols to represent words and then write notes to each other using those symbols that only they understand, the secret symbols they have made up are an example of a cipher.
- A note written by children using secret symbols they made up is an example of a cipher.
- A key that indicates what each secret symbol means is an example of a cipher.
- the symbol 0, indicating a value of zero
- a person or thing of no importance or value
- a system of secret writing based on a key, or set of predetermined rules or symbols
- a message in such writing
- the key to such a system
- an intricate weaving together of letters, as a monogram
- an Arabic numeral
Origin of cipherMiddle English cifre ; from Old French cyfre ; from Medieval Latin cifra ; from Arabic ṣifr, ṣefr, a cipher, nothing ; from ṣafara, to be empty
- to solve (an arithmetic problem)
- to write in or with a cipher ()
- The mathematical symbol (0) denoting absence of quantity; zero.
- An Arabic numeral or figure; a number.
- One having no influence or value; a nonentity.
- a. A cryptographic system in which units of text of regular length, usually letters, are transposed or substituted according to a predetermined code.b. The key to such a system.c. A message written or transmitted in such a system.
- A design combining or interweaving letters or initials; a monogram.
verbci·phered, ci·pher·ing, ci·phers also cy·phered or cy·pher·ing or cy·phered
- To put in secret writing; encode.
- To solve by means of arithmetic.
Origin of cipherMiddle English cifre, from Old French, from Medieval Latin cifra, from Arabic &slowdot;ifr, from &slowdot;afira, to be empty (translation of Sanskrit śūnyam, cipher, dot); see &slowdot;pr1 in Semitic roots.
- A numeric character.
- Any text character.
- A combination or interweaving of letters, as the initials of a name; a device; a monogram.
- a painter's cipher, an engraver's cipher, etc.
- A method of transforming a text in order to conceal its meaning.
- The message was written in a simple cipher. Anyone could figure it out.
- (cryptography) A cryptographic system using an algorithm that converts letters or sequences of bits into ciphertext.
- Ciphertext; a message concealed via a cipher.
- The message is clearly a cipher, but I can't figure it out.
- A grouping of three digits in a number, especially when delimited by commas or periods:
- The probability is 1 in 1,000,000,000,000,000 — a number having five ciphers of zeros.
- A design of interlacing initials: a decorative design consisting of a set of interlaced initials.
- (music) A fault in an organ valve which causes a pipe to sound continuously without the key having been pressed.
- A hip-hop jam session 
- The path (usually circular) shared cannabis takes through a group, an occasion of cannabis smoking.
- Someone or something of no importance.
(third-person singular simple present ciphers, present participle ciphering, simple past and past participle ciphered)
- (regional, dated) To calculate.
- I never learned much more than how to read and cipher.
cipher - Computer Definition
A system of secret writing based on a set of rules for encrypting or encoding data, converting plain text into symbolic code that can be interpreted only with the key to the code. A cipher is used to secure information against unauthorized use.
(1) The core algorithm used to encrypt data. A cipher transforms regular data (plaintext) into a coded set of data (ciphertext) that is not reversible without a key. For example, AES and DES are examples of secret key block ciphers. The complete encryption algorithm is the cipher plus the technique used to apply the cipher to the message, which can be a very intricate series of steps. See cryptography, encryption algorithm, block cipher and plaintext.