Test or experiment (5)
I believe the answer is:
trial
I believe this is a double definition.
'test' is the first definition.
(I know that test can be written as trial)
'experiment' is the second definition.
(I know that trial is a type of experiment)
(Other definitions for trial that I've seen before include "Ordeal or lawsuit" , "Experiment - adversity" , "pain in the neck" , "Ordeal, perhaps in court" , "Pilot" .)