[{"Bold_text": "noun", "List Items": ["a basic unit of luminous intensity in the International System of Units International System of Units(SI), formally defined as the luminous intensity of a source that emits monochromatic radiation of frequency 540 × 1012hertz and that has a radiant intensity of 1/683 watt/steradian: adopted in 1979 as the international standard of luminous intensity.:Cd"]}]