Can be confused:trail, trial (see synonym note at the current entry).
Synonyms 2, 3, 5. examination. Trial, experiment, test imply an attempt to find out something or to find out about something. Trial is the general word for a trying of anything: articles sent for ten days' free trial. Experiment is a trial conducted to prove or illustrate the truth or validity of something, or an attempt to discover something new: an experiment in organic chemistry. Test is a more specific word, referring to a trial under approved and fixed conditions, or a final and decisive trial as a conclusion of past experiments: a test of a new type of airplane. 4. endeavor, essay, struggle. 7. grief, tribulation, distress, sorrow, trouble, hardship. See affliction.
Dictionary.com Unabridged
Trial, The
noun
(German, Der Prozess), a novel (1925) by Franz Kafka.
1436, "act or process of testing," from Anglo-Fr. trial, noun formed from triet "to try" (see try). Sense of "examining and deciding a case in a court of law" is first recorded 1577; extended to any ordeal by 1595.