Fractions

The times recorded during the race; with timing starting just past the gate or when the gates open, then parroted for the quarter, half, three-quarters etc. Used as an indication of ability and speed.

Scratch

A horse is a scratch when injury or other necessity causes it to be withdrawn from the race.

Workout

A workout is a timed sprint over varying distances prior to a race, meant to get a horse fit enough for competition.