FluentPlex

cipher

/ˈsaɪfɚ/ noun C1
  1. A numeric character. (dated)
  2. 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.
  3. A cryptographic system using an algorithm that converts letters or sequences of bits into ciphertext. · a public-key cipher
  4. Ciphertext; a message concealed via a cipher. · The message is clearly a cipher, but I can't figure it out.
  5. A fault in an organ valve which causes a pipe to sound continuously without the key having been pressed.
  6. A hip-hop jam session. (slang)
  7. The path (usually circular) shared cannabis takes through a group, an occasion of cannabis smoking. (slang)
  8. Someone or something of no importance. (dated)

Plural ciphers

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From the library

I cannot doubt that, if we had the cipher, we should find that this communication is of the nature that I indicate.”
The Valley of Fear, p. 3 · C1
“But what is the use of a cipher message without the cipher?”
The Valley of Fear, p. 3 · C1
“Because there are many ciphers which I would read as easily as I do the apocrypha of the agony column: such crude devices amuse the intelligence without fatiguing it.
The Valley of Fear, p. 3 · C1
“Your native shrewdness, my dear Watson, that innate cunning which is the delight of your friends, would surely prevent you from inclosing cipher and message in the same envelope.
The Valley of Fear, p. 4 · C1

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.