Effect (noun)

1. The result or outcome of an action or decision.
2. The power to produce an outcome or achieve a purpose.
3. A change that is a result or consequence of an action or other cause.
4. A phenomenon or the appearance produced by a particular cause or effect.
5. The production of a desired result.

Origin:

From middle english effekte, from old french efect, from latin effectus, from efficere (to effect), from ex- + facere (to do, make).

Examples:

1. The effect of the medicine on her headache was immediate.
2. The new law will have far-reaching effects on society.
3. The effects of climate change are becoming increasingly apparent.
4. The effect of her words on the audience was electric.
5. The effect of the recession on the housing market was severe.