a powerful person, organization, group etc is able to control and influence events and other people's actions [↪ powerless]:
He was one of the most powerful men in Bohemia.
a very influential and powerful family
rich and powerful nations
having a strong effect on someone's feelings or opinions:
a powerful speech
powerful reasons/arguments (=reasons that make you think that something must be true)
Good teamwork is a powerful tool (=very effective method) for effective management.
a powerful feeling or effect is very strong or great:
Immigrants have had a powerful influence on the local culture.
a powerful sense of tradition
a powerful machine, engine, weapon etc is very effective and can do a lot:
a new generation of more powerful PCs
a machine that is immensely powerful
a powerful 24 valve engine
a powerful telescope
Jed was a powerful, well-built man.
The females are smaller and less powerful than the males.
a powerful blow, explosion etc has a lot of force:
a lot of force
an explosion ten times more powerful than the Hiroshima bomb
a powerful right-foot shot on goal
winds powerful enough to uproot trees
a powerful medicine or drug has a very strong effect on your body
a powerful team, army etc is very strong and can easily defeat other teams or armies:
a powerful fighting force
very strong, bright, loud etc:
a powerful singing voice
the powerful headlights