What is Trial ?
Trial is (noun) 1. a court case held before a judge The trial will be heard next week. to stand trial, to be on trial to appear in court She stood trial, accused of murder. He’s on trial for theft. 2. the act of testing something The new model is undergoing its final trials. on trial being tested to see if it is acceptable The system is still on trial. trial and error testing and rejecting various things until you find the one which works, so learning from mistakes We found out the best way of working was simply by trial and error. 3. a game played to select the best players for a team Trials to select the England Rugby team will be held this weekend.
source: Easier English, Student Dictionary Upper Intermediate Level