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tenacity (plural tenacities)
The quality or state of being tenacious; as, tenacity, or retentiveness, of memory; tenacity, or persistency, of purpose.  [quotations ?]
The quality of bodies which keeps them from parting without considerable force; cohesiveness; the effect of attraction; – as distinguished from brittleness, fragility, mobility, etc.
The quality of bodies which makes them adhere to other bodies; adhesiveness; viscosity.
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.