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Definition of trial run noun from the Oxford Advanced Learner's Dictionary

trial run

noun
 
/ˌtraɪəl ˈrʌn/
 
/ˌtraɪəl ˈrʌn/
(also test run)
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  1. a test of how well something new works, so that you can see if any changes are necessary
    • This year is a trial run for the new service, before it is officially introduced in 2011.
See trial run in the Oxford Advanced American Dictionary
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