(law) A legal process in which the guilt or liability of a party is determined by a jury, a group of citizens selected from the local population.

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.

(law) a court of first instance.

(law) To be put on trial in a court of law; go on trial. / (idiomatic) To sustain the trial or examination of a cause; not to give up without trial.

testing of watercraft

plural of trial balloon

(India, law) Alternative spelling of undertrial

(aeronautics, historical) A small balloon released into the sky to determine the direction and tendency of winds in the upper air before a manned ascent in a larger balloon; a ballon d'essai.

A sales promotion in which a product or service is offered in a small quantity, or for a limited period, without the need for payment.