If someone has power, they have a lot of control over people and activities.

Your power to do something is your ability to do it.

If it is in or within your power to do something, you are able to do it or you have the resources to deal with it.

If someone in authority has the power to do something, they have the legal right to do it.

If people take power or come to power, they take charge of a country's affairs. If a group of people are in power, they are in charge of a country's affairs.

You can use power to refer to a country that is very rich or important, or has strong military forces.

The power of something is the ability that it has to move or affect things.

Power is energy, especially electricity, that is obtained in large quantities from a fuel source and used to operate lights, heating, and machinery.

The device or fuel that powers a machine provides the energy that the machine needs in order to work.

Power tools are operated by electricity.

In mathematics, power is used in expressions such as 2 to the power of 4 or 2 to the 4th power to indicate that 2 must be multiplied by itself 4 times. This is written in numbers as 24, or 2 x 2 x 2 x 2, which equals 16.

You can refer to people in authority as the powers that be, especially when you want to say that you disagree with them or do not understand what they say or do.