Meaning of decipher

de•ci•pher

1. to make out the meaning of (poor or partially obliterated writing, etc.): to decipher a hastily scribbled note.
2. to discover the meaning of (anything obscure or difficult to trace or understand): to decipher hieroglyphics.
3. to interpret by the use of a key, as something written in cipher: to decipher a secret message.
4. to depict; portray.