noun🔗ShareThe state of being obscured."The sudden obscuration of the sun by dark clouds made the afternoon feel like evening. "appearanceconditionnatureChat with AIVocabulary GamePractice Reading
noun🔗ShareA unit of measurement used in particular for smoke detectors which respond to absorption of light by smoke, in percent absorption per unit length, e.g. % obs/ft, % obs/m."The fire alarm triggered when the smoke reached 4% obscuration per foot, indicating a significant amount of smoke blocking the light beam within the detector. "technicalphysicsunitsciencedeviceChat with AIVocabulary GamePractice Reading
