n. A small part or piece, especially a small part or portion of some material substance: as, a particle of dust.n. Specifically, any very small piece or part of anything: absolutely, a minute quantity; anything very small; an atom; a bit: as, he has not a particle of patriotism or virtue; are you fatigued? Not a particle.n. In grammar, a part of speech that is considered of minor consequence, or that plays a subordinate part in the structure of the sentence, as connective, sign of relation, or the like: such are especially conjunctions, prepositions, and the primitive adverbs. The term is loose and unscientific.n. Synonyms and Particle, Atom, Molecule, Corpuscle,iota, jot, mite, tittle, whit, grain, scrap, shred, scin-tilla. Atom and molecule are exact scientific terms; the other two of the italicized words are not. A particle is primarily a minute part or piece of a material substance, or, as in the case of dust, pollen, etc., a substance that exists in exceedingly minute form. Corpuscle is a somewhat old word for particle, to which it has almost entirely yielded place, taking up instead a special meaning in physiology. See definitions; see also part, n.n. In a document of any kind, a very small part of any statement or proposition; a clause.n. In the Roman Catholic Church, the host given to each lay communicant.n. In mech., a body or portion of matter so minute that, while it possesses mass, it may be treated as a geometrical point.