cipher

(noun) a message written in a secret code. Synonyms: cypher.

(noun) a mathematical element that when added to another number yields the same number. Synonyms: zero, 0, nought, cypher.

(noun) a quantity of no importance. Synonyms: nothing, nil, nix, nada, null, aught, cypher, goose egg, naught, zero, zilch, zip, zippo. Examples: "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."

(noun) a person of no influence. Synonyms: cypher, nobody, nonentity.

(noun) a secret method of writing. Synonyms: cypher, cryptograph, secret code.

(verb) convert ordinary language into code. Synonyms: code, encipher, cypher, encrypt, inscribe, write in code. Examples: "We should encode the message for security reasons."

(verb) make a mathematical calculation or computation. Synonyms: calculate, cypher, compute, work out, reckon, figure.