[{"Bold_text": "adjective", "List Items": ["without value, effect, consequence, or significance.", "being or amounting to nothing; nil; lacking; nonexistent.", "Mathematics.(of a set) empty .of measure zero.", "empty .", "of measure zero.", "being or amounting to zero."]}, {"Bold_text": "noun", "List Items": ["Electronics.a point of minimum signal reception, as on a radio direction finder or other electronic meter."]}, {"Bold_text": "verb (used with object)", "List Items": ["to cancel; make null."]}]