(Latin) “by permission of”; with reference to.
Contrary to the opinion of.
With deference to, followed by a name, used to acknowledge contradiction of the person named.

1. Town in Mississippi (USA).
2. Unincorporated community in Florida (USA).

ETYM Old Eng. pas, French pas, from Latin passus a step, pace, orig., a stretching out of the feet in walking; cf. pandere, passum, to spread, stretch; perh. akin to Eng. patent. Related to Pas, Pass.
1. A step in walking or running; SYN. stride, tread.
2. The rate of moving (especially walking or running); SYN. gait.
3. The relative speed of progress or change; SYN. rate.

Contrary to the opinion of — usually used as an expression of deference to someone's contrary opinion; usually italic

1. To go at a pace, as of a horse.
2. To measure by pacing, as of a room.
3. To measure by pacing, as of distances.
4. To regulate or set the pace of
5. To walk with slow or fast paces

(Auto racing) A high-performance car that leads a parade of competing cars through the pace lap and then pulls off the course.

(Auto racing) The first lap of a car race that prepares the cars for a fast start.

Having a particular pace (e.g. "fast-paced"); measured by steps; running at a set pace

A medical device implanted under the skin of a patient whose heart beats inefficiently. It delivers minute electric shocks to stimulate the heart muscles at regular intervals and restores normal heartbeat.
The latest pacemakers are powered by radioactive isotopes for long life and weigh no more than 15 g/0.5 oz.
An implanted electronic device that takes over the function of the natural cardiac pacemaker; SYN. artificial pacemaker.

Or sinoatrial node (SA node) In vertebrates, a group of muscle cells in the wall of the heart that contracts spontaneously and rhythmically, setting the pace for the contractions of the rest of the heart. The pacemaker's intrinsic rate of contraction is increased or decreased, according to the needs of the body, by stimulation from the autonomic nervous system. A specialized bit of heart tissue that controls the heartbeat; SYN. cardiac pacemaker, sinoatrial node, SA node.

One that sets the pace for another; one that takes the lead or sets an example