POW'ERFUL, a. 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
5. Strong intense as a powerful heat or light.
The King James Bible has stood its ground for nearly 400 years. However, during that time the English language has changed, and with it the meanings of some words it used. Here are more than 6,500 words whose definitions have changed since 1611.Wikipedia
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