Petitioner
Petitioner
That will depend on whether the case is a civil or criminal trial. In a civil court case the two sides are the defendant and the plaintiff. For a criminal court it will be the defendant (the accused) and the government entity bringing the charges, usually the State or Country.
Defendant. He has to defend him self against the plaintiff's accusation.
A person charged with a crime is being brought to the CRIMINAL courts by the state. If convicted that person may be fined or sent to prison. A person being sued is being brought to the CIVIL courts by another legal person. The side which loses the case will have to pay costs and perhaps make restitution to the person who wins.
In a criminal case it is the accuser. In a civil case - think Judge Judy - it is the Plaintiff
The party who initiates a legal case is known as the plaintiff in a civil case or the prosecution in a criminal case. They are the ones bringing the case to court and seeking a resolution or remedy for the legal issue at hand.
Plantiff
Has been charged with a crime in a criminal case or is the person being sued in a civil case.
The person that commited the crime
The person a case is held against is the "Defendant". The person holding the case against them is known as the "Plaintiff".
the person who files against you. the complainant
Civil Case