Strength; Show Spelled Pronunciation; [strengkth, strength, strenth] –noun 1.the quality or state of being strong; bodily or muscular power; vigor. 2.mental power, force, or vigor. 3.moral power, firmness, or courage. 4.power by reason of influence, authority, resources, numbers, etc. 5.number, as of personnel or ships in a force or body: a regiment with a strength of 3000. 6.effective force, potency...