Definitions from Wiktionary ( )

▸ noun:  A very small piece of matter, a fragment; especially, the smallest possible part of something.
▸ noun:  (physics) Any of various physical objects making up the constituent parts of an atom; an elementary particle or subatomic particle.
▸ noun:  (linguistics) A part of speech that has no inherent lexical definition but must be associated with another word to impart meaning, often a grammatical category: for example, the English word to in a full infinitive phrase (to eat) or O in a vocative phrase (O Canada), or as a discourse marker (mmm).
▸ noun:  (linguistics) A part of speech which cannot be inflected.
▸ noun:  (Christianity) In the Roman Catholic church, a crumb of consecrated bread; also the smaller breads used in the communion of the laity.
▸ noun:  A little bit.

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