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English definition of “petitioner”

petitioner

noun [C] uk   /pəˈtɪʃ.ən.ər/ us    //
a person who organizes or signs a petitionActivism and pressure groupsMaking appeals and requests specialized law a person who is asking for action from a law courtMaking appeals and requestsTaking legal action
(Definition of petitioner from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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