[{"Bold_text": "noun", "List Items": ["quantity or amount:the least quantum of evidence.", "a particular amount.", "a share or portion.", "a large quantity; bulk.", "Physics.the smallest quantity of radiant energy, equal to Planck's constant times the frequency of the associated radiation.the fundamental unit of a quantized magnitude, as angular momentum.", "the smallest quantity of radiant energy, equal to Planck's constant times the frequency of the associated radiation.", "the fundamental unit of a quantized magnitude, as angular momentum."]}, {"Bold_text": "adjective", "List Items": ["sudden and significant:a quantum increase in productivity."]}]