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WordNet (r) 3.0 (2006) (WordNet)

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