effect
The Italian word 'effetto' is used similarly to the English word 'effect'. It is used to refer to a change which is a result or consequence of an action or other cause. For instance, 'Questo ha avuto un grande effetto.' translates to 'This had a big effect.' in English.
The butterfly effect can change the entire course of history.
This sentence describes a situation where a small change can have large effects elsewhere, often used in chaos theory, which in this context is metaphorically referred to as the butterfly effect.
The drug has an immediate effect.
This sentence announces that a particular drug has an immediate reaction or response upon administration which is referred to as having an immediate effect.
This is the effect of climate change.
This sentence refers to a particular condition or occurrence (such as progressively warmer global temperatures, more frequent severe weather, rising sea levels, etc.) being a direct result of climate change.