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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.
The message is clearly a cipher, but I can't figure it out. cipher (Noun). A grouping of three digits in a number, especially when delimited by commas or periods: The probability is 1 in 1,000,000,000,000,000 uE000124356uE001 a number having five ciphers of zeros. cipher (Noun). A design of interlacing initials: a decorative design consisting of a set of interlaced initials.