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1. A mathematical element that when added to another number yields the same number
   - zero, 0, nought, cipher
    
2. A quantity of no importance
   - nothing, nil, nix, nada, null, aught [archaic], cipher, goose egg, naught [N. Amer], zero, zilch, zip, zippo [N. Amer]
    
3. A person of no influence
   - cipher, nobody, nonentity
    
4. A secret method of writing
   - cipher, cryptograph, secret code
    
5. A message written in a secret code
   - cipher

1. Convert ordinary language into code
   - code, encipher, cipher, encrypt, inscribe, write in code
    
2. Make a mathematical calculation or computation
   - calculate, cipher, compute, work out, reckon, figure [N. Amer]

Derived forms: cyphers, cyphered, cyphering

Type of: code, common man, common person, commoner, digit, encode, figure, message, reason, relative quantity

Encyclopedia: Cypher