n. | 1. | One of the very small invisible particles of which all ordinary matter is supposed to consist. |
2. | (Physics) The smallest part of any substance which possesses the characteristic properties and qualities of that substance, and which can exist alone in a free state. | |
3. | (Chem.) A group of atoms so united and combined by chemical affinity that they form a complete, integrated whole, being the smallest portion of any particular compound that can exist in a free state; |
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