WordNet sense 1 (capability in terms of personnel and materiel that affect the capacity to fight a war):

posture, military capability, military posture, military strength

WordNet sense 2 (the power to induce the taking of a course of action or the embracing of a point of view by means of argument or entreaty):

persuasiveness

WordNet sense 3 (an asset of special worth or utility):

forte, metier, speciality, specialty, forte, long suit, strong suit, strong point

WordNet sense 4 (the amount of energy transmitted (as by acoustic or electromagnetic radiation)):

intensity, intensity level

WordNet sense 5 (permanence by virtue of the power to resist stress or force):

durability, enduringness, lastingness

WordNet sense 6 (physical energy or intensity):

force, forcefulness

WordNet sense 7 (capacity to produce strong physiological or chemical effects):

effectiveness, potency