Prosecutor (noun)

1. A lawyer who represents the state or the public interest in criminal proceedings, and who presses charges against a person accused of a crime.
2. A person or organization that brings a legal action against someone else.

Origin:

Late 16th century from latin prosecutus, past participle of prosequi meaning to follow, pursue, from pro- meaning forward + sequi meaning to follow.

Examples:

1. The prosecutor presented evidence in court.
2. The prosecutor has decided to drop the charges.
3. The prosecutor accused the defendant of embezzlement.
4. The prosecutor was determined to win the case.
5. The defendant was represented by a public defender, while the prosecution was represented by a district attorney.