Magnetic coercivity: The ability to retain the generated magnetism in material, even though there exists all the factors for the decrease of magnetism is called magnetic coercivity of that material.
Coercivity is the power of the applied magnetic field necessary to diminish the magnetization of a given substance to zero. In other words to coerce the material to surrender its magnetism. It is a determining of the ability of a ferromagnetic substance to withstand a peripheral magnetic field without becoming demagnetized. An analogous property, electric coercivity, is the capability of a ferroelectric substance to withstand an external electric field without becoming depolarized. The coercivity of a material depends on the timescale over which a magnetization curve is calculated. The magnetization of a substance calculated at an applied reversed field which is nominally smaller than the coercivity may, over a long time scale, slowly relax to zero.