<p><strong>Verb</strong></p><ul><li>(used with object) to make out the meaning of (poor or partially obliterated writing, etc.):<ul><li>to decipher a hastily scribbled note.</li></ul></li><li>to discover the meaning of (anything obscure or difficult to trace or understand):<ul><li>to decipher hieroglyphics.</li></ul></li><li>to interpret by the use of a key, as something written in cipher:<ul><li>to decipher a secret message.</li></ul></li><li>Obsolete: to depict; portray.</li></ul><p><strong>Synonyms</strong></p><ul><li>explain, unravel, solve, comprehend</li></ul>