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English definition of “powerful”

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powerful

adjective uk   /ˈpaʊə.fəl/ us    /ˈpaʊ.ɚ-/

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.
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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.

powerful adjective (IMAGE SIZE)

having the power to increase the size of an image of something that is very small or far away many times: You'd need an extremely powerful microscope to see something so small.
powerfully
adverb uk   /-i/ us  
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 Learners Dictionary & Thesaurus © Cambridge University Press)
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