The effect of one thing on another is the change that the first thing causes in the second thing.

An effect is an impression that someone creates deliberately, for example in a place or in a piece of writing.

A person's effects are the things that they have with them at a particular time, for example when they are arrested or admitted to hospital, or the things that they owned when they died.

The effects in a film are the specially created sounds and scenery.

If you effect something that you are trying to achieve, you succeed in causing it to happen.

If you say that someone is doing something for effect, you mean that they are doing it in order to impress people and to draw attention to themselves.

You add in effect to a statement or opinion that is not precisely accurate, but which you feel is a reasonable description or summary of a particular situation.

If you put ,bring, or carry a plan or idea into effect, you cause it to happen in practice.

If a law or policy takes effect or comes into effect at a particular time, it officially begins to apply or be valid from that time. If it remains in effect, it still applies or is still valid.

You can say that something takes effect when it starts to produce the results that are intended.

You use effect in expressions such as to good effect and to no effect in order to indicate how successful or impressive an action is.

You use to this effect ,to that effect, or to the effect that to indicate that you have given or are giving a summary of something that was said or written, and not the actual words used.

If you say that something will happen with immediate effect or with effect from a particular time, you mean that it will begin to apply or be valid immediately or from the stated time.