Prosecution (noun)

1. The institution and conduct of legal proceedings against someone in respect of a criminal charge.
2. The action of pursuing or taking legal action.

Origin:

Late middle english (in the legal sense): from latin prosecutio(n-), from the verb prosecute, from prosequi "follow, pursue".

Examples:

1. The prosecution called its final witness to the stand.
2. The defense lawyer is preparing a case to discredit the prosecution's evidence.
3. The prosecution has the burden of proving its case beyond a reasonable doubt.
4. The prosecution is accusing the defendant of embezzlement.
5. The prosecution rested its case after presenting several key pieces of evidence.