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English definition of “trial”

trial

noun [C/U] (TEST)   /ˈtrɑɪˌəl, trɑɪl/
a test , usually over a limited period of time , to discover how effective or suitable something or someone is: [C] The agency plans to conduct clinical trials of the drug . [U] We have the videotapes on a trial basis for one week – if we don’t like them, we can send them back.
(Definition of trial noun (TEST) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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