1. noun
They will perform the trials for the new equipment next week.
b) appearance at judicial court.
That boy was a trial to his parents
2. adjective
a) Pertaining to a trial or test.
b) Attempted on a provisional or experimental basis.
3. verb
a) To carry out a series of tests on (a new product, procedure etc.) before marketing or implementing it.
The warning system was extensively trialled before being fitted to all our vehicles.
b) To try out (a new player) in a sports team.
The team trialled a new young goalkeeper in Saturdays match, with mixed results.
Wikipedia foundation.