What does gait means?

it is trotting,cantering,galloping,and running even walking is a gait because the horse steps 4 beats.

There are four gaits referred to in horsemanship...the walk, trot, canter and gallop. These are determined not only by speed, but how the horse places its hooves down during the gait (3 beats or 4). When you hear someone refer to a horse as "gaited", it means the horse does not trot. This typically refers to "smoother" horses such as the Tennessee Walker, but is not limited to breeds like this.