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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.
â¢ CIPHER (verb). The verb CIPHER has 2 senses: 1. convert ordinary language into code. 2. make a mathematical calculation or computation. Familiarity information: CIPHER used as a verb is rare.