| a. | 1. | Full of power; capable of producing great effects of any kind; potent; mighty; efficacious; intense; |
| 2. | (Mining) Large; capacious; - said of veins of ore. |
| Adj. | 1. | powerful - having great power or force or potency or effect; "the most powerful government in western Europe"; "his powerful arms"; "a powerful bomb"; "the horse's powerful kick"; "powerful drugs"; "a powerful argument" |
| 2. | powerful - strong enough to knock down or overwhelm; "a knock-down blow" Synonyms: knock-down | |
| 3. | powerful - having the power to influence or convince; "a cogent analysis of the problem"; "potent arguments" | |
| 4. | powerful - (of a person) possessing physical strength and weight; rugged and powerful; "a hefty athlete"; "a muscular boxer"; "powerful arms" | |
| 5. | powerful - displaying superhuman strength or power; "herculean exertions" Synonyms: herculean | |
| Adv. | 1. | powerful - (Southern regional intensive) very; "the baby is mighty cute"; "he's mighty tired"; "it is powerful humid"; "that boy is powerful big now"; "they have a right nice place" |
| (language) | PowerFuL - A language combining functional programming and logic programming, using "angelic Powerdomains". |