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Word: atom
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Meaning:
Noun:
- historical A theoretical particle of matter, imagined to be incapable of further division; the smallest possible unit of substance.
- mathematics A non-zero member of a Boolean algebra that is not a union of any other elements.
- obsolete The smallest mediaeval unit of time, equal to fifteen ninety-fourths of a second.
- physics The smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons.
- The smallest, indivisible constituent part or unit of something.
Source: Wiktionary
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