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Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  cipher, cypher(noun) a message written in a secret code. 2  zero, 0, nought, cipher, cypher(noun) a mathematical element that when added to another number yields the same number.
Plaintext and Ciphertext. In the study of cryptography the terms plaintext and ciphertext are used to describe the plain language message or information and the resulting encrypted message or data that results from the use of a cipher or encryption algorithm.