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particle

noun [C] (GRAMMAR)
 
 
/ˈpɑː.tɪ.kl̩/ US  /ˈpɑːr.t̬ə-/

Definition

a word or a part of a word that has a grammatical purpose but often has little or no meaning: In the sentence 'I tidied up the room', the adverb 'up' is a particle.Grammatical termsMorphology and parts of words
(Definition of particle noun (GRAMMAR) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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