[{"Bold_text": "noun", "List Items": ["something improvised in speech, music, etc.:Was that joke part of your speech or an ad lib?"]}, {"Bold_text": "adverb", "List Items": ["at one's pleasure; without restriction.", "freely; as needed; without stint:Water can be given to the patients ad lib."]}, {"Bold_text": "abbreviation for", "List Items": ["ad libitum ad libitum."]}, {"Bold_text": "verb (used with object)", "List Items": ["to improvise all or part of (a speech, a piece of music, etc.):to ad-lib one's lines."]}, {"Bold_text": "verb (used without object)", "List Items": ["to act, speak, etc., without preparation:Throughout the play he had to ad-lib constantly."]}, {"Bold_text": "adjective", "List Items": ["impromptu; extemporaneous:ad-lib remarks to hecklers."]}]