In quantum mechanics, a quantum state that has a definite value for a particular observable; a state where measuring a physical property yields a certain result.
From German 'eigen' (own/characteristic) plus 'state,' a quantum mechanics term describing systems with well-defined properties.
An eigenstate is what physicists call a 'definite state'—but here's the weird part: an electron can be in multiple quantum states at once until you measure it, at which point it 'collapses' into a single eigenstate.
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