Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. A dynamic quantum mechanical state whose wave function is an eigenvector that corresponds to a physical quantity
Etymologies
from Wiktionary, Creative Commons Attribution/ShareAlike License
Examples

For ten points, calculate in the Heisenberg picture the time evolution of a harmonic oscillator state produced by acting on the lowestenergy eigenstate with a spatial translation operator.

In the Copenhagen formalism, one could calculate the probabilities of various outcomes assuming a measurement was taken at a particular time; during the interval between measurements, those “probability amplitudes” changed in definite, calculatable ways, while at the instant of measurement, another process took over and caused the system being measured to settle into a single eigenstate.

I suspect that DM consists largely of neutralinos, which is a mixed eigenstate of the supersymmetric pairs of the photon, Higgs and Z particle.
Dark Matter Detector Heading to the ISS This Summer  Universe Today

Probably the likeliest candidate is the neutralino, which is a mixed eigenstate or condensate of the supersymmetric pairs of the photon, higgs and Z_0 particle.
New CMB Measurements Support Standard Model  Universe Today

Of course it may also be possible to break the EPR argument for the dilemma plausibly by questioning some of its other assumptions (e.g., separability, the reduction postulate, or the eigenvalueeigenstate link).

That eigenstate applies to the reality there and that eigenstate enables us to predict a determinate position for Niels 'system with probability one.

It certifies that the predicted position value, corresponding to the position eigenstate, is an element of the reality that pertains to Niels 'system.

In this formulation of the argument it is clear that localityseparability conflicts with the eigenvalueeigenstate link, which holds that a quantity of a system has an eigenvalue if and only if the state of the system is an eigenstate of that quantity with that eigenvalue (or a mixture of such eigenstates).

Provided we maintain the eigenvalueeigenstate link, the quantum description by means of that state function will yield neither conclusion, and hence the quantum description is incomplete.

B.when measured, unless the quantum state is an eigenstate of the measured observable A, the system does not possess any categorical property corresponding to A's having a specific value in the set B. Putnam seems to assume that a realist interpretation of (*) should consist in assigning to A some unknown value within B. for which quantum mechanics yields a nontrivial probability.
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