Noah Webster's New International Dictionary of the English Language
1. (n.) The quality or state of being strong; ability to do or to bear; capacity for exertion or endurance, whether physical, intellectual, or moral; force; vigor; power; as, strength of body or of the arm; strength of mind, of memory, or of judgment.
2. (n.) Power to resist force; solidity or toughness; the quality of bodies by which they endure the application of force without breaking or yielding; -- in this sense opposed to frangibility; as, the strength of a bone, of a beam, of a wall, a rope, and the like.
3. (n.) Power of resisting attacks; impregnability.
4. (n.) That quality which tends to secure results; effective power in an institution or enactment; security; validity; legal or moral force; logical conclusiveness; as, the strength of social or legal obligations; the strength of law; the strength of public opinion; strength of evidence; strength of argument.
5. (n.) One who, or that which, is regarded as embodying or affording force, strength, or firmness; that on which confidence or reliance is based; support; security.
6. (n.) Force as measured; amount, numbers, or power of any body, as of an army, a navy, and the like; as, what is the strength of the enemy by land, or by sea?
7. (n.) Vigor or style; force of expression; nervous diction; -- said of literary work.
8. (n.) Intensity; -- said of light or color.
9. (n.) Intensity or degree of the distinguishing and essential element; spirit; virtue; excellence; -- said of liquors, solutions, etc.; as, the strength of wine or of acids.
10. (n.) A strong place; a stronghold.
11. (v. t.) To strengthen.