An empirical test of the suitability or effectiveness of a method or thing by running it at least once.

plural of trial run

A trial in which a plaintiff seeks damages or other remedy from a defendant; a lawsuit

(medicine) A test of a medication or other medical treatment (such as a medical device), usually a comparison against a placebo, other medications or devices, or the standard medical treatment for a patient's condition.

testing of watercraft

plural of sea trial

plural of trial and error

plural of trial by ordeal

plural of time trial

plural of bench trial