The formal English meaning of the word has no legal equivalent into Portuguese.
There are multiple definitions - click on the translation that matches your context.
(also: criminal prosecution) bringing a criminal case before a court; when someone is prosecuted
Civil rights groups have criticised the decision not to seek prosecutions.
(FORMAL) the taking part in a planned activity, often a war
The government must accept that the prosecution of this war will be long, expensive and cost enormous loss of life.
in a trial, the prosecution are the lawyers who try to prove that a person accused of committing a crime is guilty of that crime
The prosecution allege that the money was obtained fraudulently.