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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.
Word Origin and History for cipher. n. late 14c., arithmetical symbol for zero, from Old French cifre nought, zero, Medieval Latin cifra, with Spanish and Italian cifra, ultimately from Arabic sifr zero, literally empty, nothing, from safara to be empty; loan-translation of Sanskrit sunya-s empty.. The word came to Europe with Arabic numerals.