(biology) A periodic biological system.

(physics) A crystal that has a structure that repeats not only in space, but also in time.

plural of time crystal

plural of time dilation

Alternative spelling of part-time

The time it takes to finish a race judged by the time calculated on a transponder worn by the competitor.

The time it takes to finish a race from when the starter's gun (or other signal) is sounded until crossing the finish line, irrespective of when the competitor actually starts.

(education) The amount of time a student has spent attending a particular course.

(computing) The actual time of day, as would be seen on a wall clock; contrasted with the (possibly inaccurate) time according to a computer system.

Ever.