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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.
cypher - a quantity of no importance; it looked like nothing I had ever seen before; reduced to nil all the work we had done; we racked up a pathetic goose egg; it was all for naught; I didn't hear zilch about it. goose egg, nada, naught, nil, nix, nothing, null, zero, zilch, zip, zippo, aught, cipher.