1
: having the ability to control or influence people or things
rich and powerful people
a powerful ally
The country is becoming more and more powerful.
2
: having a strong effect on someone or something
powerful drugs that attack cancer cells
The cash bonus provides a powerful incentive to workers.
powerful emotions/images
The perfume has a powerful smell.
It's a very powerful movie.
He gave a powerful [=moving] speech.
a powerful [=convincing, compelling] argument
3
: having or producing a lot of physical strength or force
powerful magnets
a powerful machine/motor/force
The dog has a powerful body.
She has a powerful voice.
The weapons are very powerful.
The aardvark uses its powerful claws to dig for food.
4
: capable of doing many things in a fast and efficient way
His new computer is more powerful than the one I have.
Cite this Entry
“Powerful.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/powerful. Accessed 19 Jun. 2026.
Copy Citation
