verb (v)

• convert code into ordinary language(verb.communication)

  Synonym:
  decode, decrypt
  Antonym:
  encode
  

  source: wordnet30
• read with difficulty(verb.cognition)

  Example:
  Can you decipher this letter?.
  

  Synonym:
  trace
  

  source: wordnet30
• To translate from secret characters or ciphers into intelligible terms; as, to decipher a letter written in secret characters.(verb)

  source: webster1913