<p><strong>Noun:</strong></p><ul><li>A minute portion, piece, fragment, or amount; a tiny or very small bit: a particle of dust; not a particle of supporting evidence.</li><li>Synonyms: speck, grain, tittle, jot, iota, whit, mite.</li><li>Physics. One of the extremely small constituents of matter, as an atom or nucleus.</li><li>An elementary particle, quark, or gluon.</li><li>A body in which the internal motion is negligible.</li><li>A clause or article, as of a document.</li><li>Grammar. (In some languages) one of the major form classes, or parts of speech, consisting of words that are neither nouns nor verbs, or of all uninflected words, or the like.</li><li>Such a word.</li><li>A small word of functional or relational use, as an article, preposition, or conjunction, whether of a separate form class or not.</li><li>Roman Catholic Church. A small piece of the Host given to each lay communicant in a Eucharistic service.</li></ul>