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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.
Synonyms and Antonyms of cipher. 1  1 the numerical symbol 0 or the absence of number or quantity represented by it remember to put the cipher after the decimal point Synonyms aught, zero, goose egg, naught (also nought), nil, nothing, o, oh, zilch, zipRelated Words blank, void.