tenacity in Bulgarian

The quality or state of being tenacious, or persistence of purpose; tenaciousness.

The quality of bodies which makes them adhere to other bodies; adhesiveness, viscosity.

(physics) The greatest longitudinal stress a substance can bear without tearing asunder, usually expressed with reference to a unit area of the cross section of the substance, as the number of pounds per square inch, or kilograms per square centimeter, necessary to produce rupture.