We found 6 dictionaries that define the word mass observation:

General (6 matching dictionaries)

1. Mass Observation: Merriam-Webster
2. mass observation: Oxford Learner's Dictionaries
3. mass observation: Collins English Dictionary
4. Mass-Observation, Mass Observation: Wikipedia, the Free Encyclopedia
5. mass observation: TheFreeDictionary.com
6. Mass Observation: Merriam-Webster

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