In this study, we reconsider electron temperature of non-equilibrium plasmas based on thermodynamic and statistical-mechanics physics by rigorous calculation of their entropy. As a concrete procedure, we carry out the following things. In the first place, we solve Boltzmann equation, and we obtain EEDF of the non-equilibrium plasma. In the second place, by the method of the statistical-mechanics, we obtain the mean electronic energy interpreted as internal energy and entropy from EEDF and describe entropy for a function of the energy. Furthermore, based on thermodynamic principle, we obtain electron "temperature" which have non-equilibrium EEDF by the taking of derivative of entropy as we discussed previously, with respect to mean electron energy, and taking its reciprocal number. Finally, we discuss about "Temperature" above from statistical thermodynamics-like viewpoint.
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