a race in which competitors are timed individually on a set distance over a course or track, especially to qualify for a successive event.
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British Dictionary definitions for time trial
(esp in cycling) a race in which the competitors compete against the clock over a specified course
Derived Formstime-trialling, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012