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The definition of cordiality is sincere kindness. An example of cordiality is thanking each guest at a party. cordiality. pl. cordiality. The practice of being cordial.
Definition of viscosity. plural. viscosities. 1 : the quality or state of being viscous. 2 : the property of resistance to flow in a fluid or semifluid. 3 : the ratio of the tangential frictional force per unit area to the velocity gradient perpendicular to the direction of flow of a liquid âcalled also coefficient of viscosity.