(pās) noun
1. A step in walking; also, the progress made in one such movement.
2. A conventional measure of length approximating the average length of stride in walking: usually 3 feet, but sometimes 3.3 feet, making 5 paces to the rod. The Roman pace was measured from the point where the heel of one foot left the ground to the point where it descended in the next stride, and was 5 Roman feet, equal to about 58.1 inches, a thousand such double strides making a mile. Such a double step is now called a geometrical pace, reckoed at 5 feet. The U.S. Army regulation pace is 30 inches, quick time; 36 inches, double time.
3. The manner or speed of movement in going on the legs; gait; carriage and action, especially of a horse.
4. Rate of speed, as in movement or work: often applied to a fast or ruinous life: the pace that kills; also, the speed with which a baseball pitcher delivers the ball.
5. A gait of a horse, etc., in which both feet on the same side are lifted and moved forward at once.
—to put (one) through his paces To test the abilities, speed, etc., of.
—v. paced, pac·ing v.t.
1. To walk back and forth across: to pace the floor.
2. To measure by paces.
3. To set or make the pace for.
4. To train to a certain gait or pace.
—v.i.
5. To walk with slow or regular steps.
6. To move at a pace (def. 5). [<F pas <L passus step <pandere stretch. Doublet of PASS noun]

(pā′sē) adverb & prep.
With the permission (of): used to express courteous disagreement. [<L, ablative of pax, pacis peace, pardon]