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English definition of “petitioner”

petitioner

noun [C]     /pəˈtɪʃ.ən.ər/ US  //
a person who organizes or signs a petition Activism and pressure groupsMaking appeals and requests specialized law a person who is asking for action from a law court Making appeals and requestsTaking legal action
(Definition of petitioner noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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