Meaning of cipher

Definition of cipher

(noun) a message written in a secret code
a mathematical element that when added to another number yields the same number
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"
a person of no influence
(verb) convert ordinary language into code; "We should encode the message for security reasons"

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