Light is the brightness that lets you see things. Light comes from sources such as the sun, moon, lamps, and fire.

A light is something such as an electric lamp which produces light.

You can use lights to refer to a set of traffic lights.

If a place or object is lit by something, it has light shining on it.

If it is light, the sun is providing light at the beginning or end of the day.

If a room or building is light, it has a lot of natural light in it, for example because it has large windows.

If you light something such as a cigarette or fire, or if it lights, it starts burning.

If someone asks you for a light, they want a match or cigarette lighter so they can start smoking.

If something is presented in a particular light, it is presented so that you think about it in a particular way or so that it appears to be of a particular nature.

You can refer to the type of influence that something has on situations, people, or things as the light of that situation, person, or thing.

You say that something is done or is acceptable according to someone's lights when you mean that it is done or is acceptable according to their own ideas and standards.

If there is a light in someone's eyes, there is an expression in their eyes that shows you the mood they are in or what they are thinking about.

If something comes to light or is brought to light, it becomes obvious or is made known to a lot of people.

If light dawns on you, you begin to understand something after a period of not being able to understand it.

First light is the time in the early morning when light first appears and before the sun rises.

If someone in authority gives you a green light, they give you permission to do something.

If something is possible in the light of particular information, it is only possible because you have this information.

If someone goes out like a light, they fall asleep or become unconscious very quickly or immediately.

If you say that an object sees the light of day or sees the light, you mean that it is taken out of the place where it is stored.

If something sees the light of day at a particular time, it comes into existence or is made known to the public at that time.

If someone sees the light, they finally realize something or change their attitude or way of behaving to a better one.

If you set light to something, you make it start burning.

To shed light on ,throw light on, or cast light on something means to make it easier to understand, because more information is known about it.

When you talk about the light at the end of the tunnel, you are referring to the end of the difficult or unpleasant situation that you are in at the moment.