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English definition of “pacemaker”

pacemaker

noun [C] (RUNNER)    /ˈpeɪsˌmeɪ.kər/ US  /-kɚ/ (also pacesetter,   /-ˌset.ər/   US  /-ˌset̬.ɚ/)
the person or animal that establishes the speed in a race, or a person or organization that is an example for others by being successfulCompetitors and participants in sports and gamesDescribing the leading position
(Definition of pacemaker noun (RUNNER) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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