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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.
Cipher's. There are a number of different code ciphers for different things in gaming, like message encryption and simple secrete lettering between senders. One of the most simple of ciphers is a number Cipher that consists of the 26 letters of the alphabet being coded each by number a-1, b-2, and so on.