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mass defect
mass-energy equation
mass-energy equivalence
mass extinction
mass-market
mass media
mass noun
mass number
mass observation
mass-produce
mass production
mass society
mass sociogenic illness
mass spectrometer
mass spectrum
mass transit
mass wasting
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mass observation
mass ob·ser·va·tion


noun 
Definition:
 
U.K. recording of social behavior: a method of observing how people act in social contexts by collating the subjects' own reports, diaries, and responses to questionnaires
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