Strength
1. The state, property, or quality of being strong.
2. The power to resist attack; impregnability.
3. The power to resist strain or stress; durability.
4. The ability to maintain a moral or intellectual position firmly.
5. Capacity or potential for effective action: a show of strength.
6. a. The number of people constituting a normal or ideal organization: The police force has been at half strength since the budget cuts.
b. Military capability in terms of personnel and materiel: an army of fearsome strength.
7. a. A source of power or force.
b. One that is regarded as the embodiment of protective or supportive power; a support or mainstay.
c. An attribute or quality of particular worth or utility; an asset.
8. Degree of intensity, force, effectiveness, or potency in terms of a particular property, as:
a. Degree of concentration, distillation, or saturation; potency.
b. Operative effectiveness or potency.
c. Intensity, as of sound or light.
d. Intensity or vehemence, as of emotion or language.
9. Effective or binding force; efficacy: the strength of an argument.
10. Firmness of or a continuous rising tendency in prices, as on the stock market.
Synonyms: strength, power, might, energy, force
These nouns denote the capacity to act or work effectively. Strength refers especially to physical, mental, or moral robustness or vigor: "enough work to do, and strength enough to do the work" (Rudyard Kipling).