  We report on the $U_{A}(1)$ symmetry restoration resulting due to temperature
dependence of the coefficient c(T) for the Kobayashi-Maskawa-'t Hooft
determinant (KMT) term in a modified 2+1 flavor Polyakov loop quark meson model
having fermionic vacuum correction term (PQMVT).Temperature dependence of KMT
coupling c(T) drives the non-strange condensate melting to significantly
smaller temperatures in comparison to the constant c case.Further due to c(T),
$m_{\eta^{\prime}}$ decreases from its vacuum value by 220 MeV near T=176 MeV
after the chiral transition ($T_{c}^{\chi}=154.9$ MeV).This is similar to the
$\eta^{\prime}$ in-medium mass drop of at least 200 MeV as reported by Csorgo
and Vertesi in Ref (Phys Rev Lett 105:182301,2010; Phys Rev C 83:054903,2011),
as an experimental signature of the effective restoration of $U_A(1)$ symmetry.
The pseudoscalar mixing angle $\theta_p$ achieves anti-ideal mixing in the
influence of c(T). The $\eta $ meson becomes light quark system ($ \eta_{NS} $)
at T=176 MeV and changes its identity with $ \eta' $ meson which becomes
strange quark system ($ \eta_{S} $). The degenerated temperature variations of
$\sigma$, $\pi$ meson masses merges with the temperature variations of the
masses of degenerated $a_{0}$, $\eta$ mesons near 275 MeV. It means that for
c(T) when $m_{\sigma}=400$ MeV, the $U_{A}(1)$ restoration takes place at 1.75
$T_{c}^{\chi}$=275 MeV.
