American Dictionary of the English Language

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POW'ERFUL, adjective Having great physical or mechanical power; strong; forcible; mighty; as a powerful army or navy; a powerful engine.

1. Having great moral power; forcible to persuade or convince the mind; as a powerful reason or argument.

2. Possessing great political and military power; strong in extent of dominion or national resources; potent; as a powerful monarch or prince; a powerful nation.

3. Efficacious; possessing or exerting great force or producing great effects; as a powerful medicine.

4. In general, able to produce great effects; exerting great force or energy; as a powerful eloquence.

The word of God is quick and powerful Hebrews 4:12.

5. Strong; intense; as a powerful heat or light.