[{"Bold_text": "adjective", "List Items": ["directed to the past; contemplative of past situations, events, etc.", "looking or directed backward.", "retroactive, as a statute."]}, {"Bold_text": "noun", "List Items": ["an art exhibit showing an entire phase or representative examples of an artist's lifework.", "any exhibition or series of showings or performances, as of musical works or motion pictures, representing the work of an artist or performer over all or a major part of a career:a retrospective of John Ford's movies."]}]