Definition of particle noun from the Oxford Advanced American Dictionary



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  1. 1a very small piece of something particles of dust dust particles There was not a particle of evidence (= no evidence at all) to support the case.
  2. 2 (physics) a very small piece of matter, such as an electron or a proton, that is part of an atom see also alpha particle, elementary particle
  3. 3 (grammar) an adverb or a preposition that can combine with a verb to make a phrasal verb In “She tore up the letter,” the word “up” is a particle. see also adverbial particle
See the Oxford Advanced Learner's Dictionary entry: particle