The dielectric polarizability-related factors contributing to the τ e have been analysed in terms of dielectric permittivity e, Tolerance Factor (TF), and octahedron tilt angles in (1-x)CaTiO₃-x[A(B', B")O₃] (A= Ca, La, Li, B'= Al, Fe, Mg, B"= Nb, Ta) and (Sr 0.2 Ca 0.8 )(Ti 1-x Zr x )O₃. All the compounds have the orthorhombic Pbnm structure except the end members A(B', B")O₃ and the solid solutions of x≥0.8. The additional dipole field effect is suggested as a dominant factor contributing to τ e in CaTiO₃-based ceramics having relatively large e, which has not been generally considered in the previous reports dealing with the τ e . This study has been focussed on delineating the dipole field effect on the τ e in comparison to the octahedron tilt effect in CaTiO₃-based ceramics.