American English

Definition of powerful adjective from the Oxford Advanced American Dictionary

      

    powerful

     adjective
    adjective
    NAmE//ˈpaʊərfl//
     
     
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  1. 1(of people) being able to control and influence people and events synonym influential an immensely powerful organization one of the most powerful directors in Hollywood a rich and powerful man Only the intervention of powerful friends obtained her release.
  2. 2having great power or force; very effective powerful weapons a powerful engine a powerful voice a powerful telescope I traded my computer in for a more powerful model.
  3. 3having a strong effect on your mind or body a powerful image/drug/speech Television may have a powerful influence on children. Fear is a powerful emotion. There is a powerful argument for changing the law.
  4. 4(of a person or an animal) physically strong synonym muscular a powerful body a powerful athlete
NAmE//ˈpaʊərfli//
 
adverb a powerfully emotive song He is powerfully built (= he has a large strong body). She argued powerfully for reform.
See the Oxford Advanced Learner's Dictionary entry: powerful