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English definition of “particle”

particle

noun uk   /ˈpɑː.tɪ.kl̩/ us    /ˈpɑːr.t̬ə-/

particle noun (GRAMMAR)

[C] 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

particle noun (SMALL PIECE)

C2 [C] an extremely small piece of matter: Dust particles must have got into the motor. Electrons are atomic particles.Words meaning small pieces and amounts [S] a very small amount of something: She wouldn't give me even the slightest particle of information about what she'd been doing.Words meaning small pieces and amounts
(Definition of particle from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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