[{"Bold_text": "noun", "List Items": ["the part of a piano duet played on the upper half of the keyboard.", "the first or leading part in an ensemble."]}, {"Bold_text": "adjective", "List Items": ["Slang.first-class:dinner at a primo restaurant.highly valuable or most essential:the primo player on the team.", "first-class:dinner at a primo restaurant.", "highly valuable or most essential:the primo player on the team."]}]