Definition of “powerful” - English Dictionary

“powerful” in British English

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powerfuladjective

uk /ˈpaʊə.fəl/ us /ˈpaʊ.ɚ.fəl/

powerful adjective (CONTROL)

B1 having a lot of power to control people and events:

The president is more powerful than the prime minister.
She's the most powerful person in the organization.

More examples

powerful adjective (STRENGTH)

B1 having a lot of strength or force:

She's an extremely powerful runner.
The picture quality is bad because the TV signal isn't powerful enough.

B2 having a very great effect:

a powerful drug
Her speech about cruelty to children was very powerful.
powerfully
adverb uk /ˈpaʊə.fəl.i/ us /ˈpaʊ.ɚ.fəl.i/

B2

He argued powerfully and persuasively against capital punishment.
She kicked the ball so powerfully that it flew over the hedge.
Klaus is a very powerfully built man (= has a body with large strong muscles).

(Definition of “powerful” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“powerful” in American English

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powerfuladjective

us /ˈpɑʊ·ər·fəl/

powerful adjective (STRONG)

strong:

The picture quality is bad because the TV signal isn’t powerful enough.

Things that are powerful have a strong effect:

a powerful drug

powerful adjective (CONTROLLING)

having a lot of power:

He’s in a powerful position as an adviser of the president.

(Definition of “powerful” from the Cambridge Academic Content Dictionary © Cambridge University Press)