powerpowerpowerspoweredpoweringnoun1(no plural) the ability to control people or things; the ability to do things: The president has a lot of power. I did everything in my power (= everything I could do) to help her.2(pluralpowers) the right to do something: Police officers have the power to arrest people.3(pluralpowers) a strong person or country: There is a meeting of world powers in Rome next week.4(no plural) the energy or strength that somebody or something has: The ship was helpless against the power of the storm.5(no plural) energy that can be collected and used for making machines work, making electricity, etc.: nuclear power