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definition of the word atom

by the Wiktionnary

From Old French atome from Latin atomus (smallest particle) from Ancient Greek ἄτομος (atomos), indivisible) from ἀ- (a-), not) + τέμνω (temnō), I cut).

Singular
atom

Plural
atoms

atom (plural atoms)

  1. (obsolete) The smallest mediaeval unit of time, equal to fifteen ninety-fourths of a second.
  2. (historical) A theoretical particle of matter, imagined to be incapable of further division; the smallest possible unit of substance.
  3. (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.
  4. (mathematics) A non-zero member of a Boolean algebra that is not a union of any other elements.
  5. The smallest, indivisible constituent part or unit of something.


Definition from Wiktionary
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