[{"Bold_text": "noun", "List Items": ["the act of attenuating attenuatingor the state of being attenuated .", "the process by which a virus, bacterium, etc., changes under laboratory conditions to become harmless or less virulent.", "Physics.a decrease in a property, as energy, per unit area of a wave or a beam of particles, occurring as the distance from the source increases as a result of absorption, scattering, spreading in three dimensions, etc."]}]