double-blind study with crossover meaning, double-blind s... | English Cobuild dictionary

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A double-blind study or experiment compares two groups of people, one of which is being tested while the other is not. Neither the people doing the testing nor the members of the two groups know which group is being tested.      adj  
In a double-blind trial, there were definite improvements.     
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Collaborative Dictionary     English Cobuild
the study of human action and conduct
1. the art of public speaking in which gesture, vocal production, and delivery are emphasized 2.the study of formal speaking in pronunciation, grammar, style, and tone.
a field of study searching for ways to prevent global warming by deliberately changing Earth's natural system
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