What is the meaning of the word "cypher"?

Definitions:

  1. a mathematical element that when added to another number yields the same number copy to clipboard noun
    • Zero is an example of a cipher. copy to clipboard
  2. a message written in a secret code copy to clipboard noun
    • I could not decode the cipher that was sent to me. copy to clipboard
  3. a person of no influence copy to clipboard noun
    • At work, I'm just a cipher. copy to clipboard
  4. a secret method of writing copy to clipboard noun
    • I taught my allies the cipher. copy to clipboard
  5. to convert ordinary language into code copy to clipboard verb
    • I ciphered the message so my enemies could not read my plans. copy to clipboard
  6. to make a mathematical calculation or computation copy to clipboard verb
    • I ciphered the result quite easily. copy to clipboard

Synonyms: