I. pace ‧ mak ‧ er /ˈpeɪsˌmeɪkə $ -ər/ BrE AmE noun [countable]
1 . a small machine that is placed inside someone’s chest in order to help their heart beat regularly
2 . ( also pacesetter ) a person or horse who goes to the front in a race and sets the speed that the others must try to achieve
II. pace ‧ set ‧ ter /ˈpeɪs-setə $ -ər/ BrE AmE ( also pacemaker ) noun [countable]
1 . a person or team that is winning in a competition, and that others have to try to defeat:
That left him three strokes behind the pacesetter, Parry.
2 . a person or company that is considered to be a leader in a particular area of activity:
a new company, now seen as the industry’s pacesetter
3 . ↑ pacemaker (2)