1. (noun) zero, 0, nought, cipher, cypher
a mathematical element that when added to another number yields the same number
2. (noun) nothing, nil, nix, nada, null, aught, cipher, cypher, goose egg, naught, zero, zilch, zip, zippo
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"
3. (noun) cipher, cypher, nobody, nonentity
a person of no influence
4. (noun) cipher, cypher, cryptograph, secret code
a secret method of writing
5. (verb) cipher, cypher
a message written in a secret code
6. (verb) code, encipher, cipher, cypher, encrypt, inscribe, write in code
convert ordinary language into code
"We should encode the message for security reasons"
7. (verb) calculate, cipher, cypher, compute, work out, reckon, figure
make a mathematical calculation or computation
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Definitions of cypher 
