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