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plural eigenstates
(physics) A dynamic quantum mechanical state whose wave function is an eigenvector that corresponds to a physical quantity quotations examples
In all quantum theories, basis vectors (which are typically eigenstates) are abstractions of the unit basis vectors along the 3D axes. A general state is a vector sum of certain amounts of each basis vector state.
2013, Robert D. Klauber, Student Friendly Quantum Field Theory, 2nd edition, Fairfield, IA: Sandtrove Press, published 2018, §3.11.4, page 68