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What is a particle?

What is a particle? Here are some definitions.

Noun
  1. A very small piece of matter, a fragment; especially, the smallest possible part of something. [from 14th c.]
  2. (linguistics) A part of speech which cannot be inflected: an adverb, preposition, conjunction or interjection.
  3. (linguistics) A word that has a particular grammatical function but does not obviously belong to any particular part of speech, such as the word to in English infinitives or O as the vocative particle.
  4. (physics) Any of various physical objects making up the constituent parts of an atom; an elementary particle or subatomic particle. [from 19th c.]
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One beta particle is then lost and UX2 belonging to the fifth group is formed.
Thus uranium in the sixth group loses an alpha particle and the product UX1 falls in the fourth group.
The particle physics community began adapting existing high-energy accelerators to provide heavy-ion nuclear beams.
If any particle of organic matter falls into a carboy of acid, it is decomposed, and imparts a dark color to the liquid.
However, as a subatomic particle the electron is also a quantum-mechanical object.
Every particle of food must be aerated in the lungs before it can be assimilated.

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