Turdimurod Rakhmanov (asker) Feb 28, 2023:

Further a Petitioner is a person who files a petition [1] in the higher court who has lost in the lower court. A petitioner can be a plaintiff or defendant in lower court as either of the parties can present the case to a higher court for further proceedings. The person against whom a petition is filed by the petitioner in higher court is known as the Respondent. Respondent can be either the plaintiff or defendant from the lower court.
Whereas an Appellant is a person who makes an appeal [2] to a higher court, he is the one who is not satisfied by the decision of the lower court. Appellant can be either the plaintiff or defendant who is not satisfied with decision made by the lower court.
The person who is named in the appeal and who responds to appellant’s claims of fault in the underlying decision of the lower court is known as Respondent or Appellee.
As we now have an idea of what the above terms mean we will further study them in detail.
Plaintiff is a word which is derived from a French word “Plaintive” which means to express one’s suffering or woe. Plaintiff is the person who sues the defendant for the damages suffered by him.

Turdimurod Rakhmanov (asker) Feb 23, 2023:

заявитель истец, ответчик Истец — это лицо, обратившееся в суд с иском и полагающее, что его права и законные интересы нарушены. Ответчик — это лицо, указанное истцом в качестве ответчика, предполагаемого нарушителя прав и законных интересов истца. Заявитель — это лицо, обратившееся в суд в порядке особого производства.
In the court of Appeal, Appellant and Petitioner are the same thing=Истец. Lilian and Irina's variants are correct. But I am still not sure what "заявитель" is?

Turdimurod Rakhmanov (asker) Feb 4, 2023:

petitioner? complainant? Petitioner- is a person who brings a legal case to a court of law. [LEGAL] The judge awarded the costs of the case to the petitioners.
Complainant - физическое или юридическое лицо, подающее претензию; истец; жалобщик is a person who starts a court case in a court of law.
Litigant- is a person who is involved in a civil legal case, either because they are making a formal complaint about someone, or because a complaint is being made about them.
Истец = он всегда подает заявление ПРОТИВ кого-то, Т.е. если есть истец, то есть и ответчик.
Заявитель же - это более широкое понятие, он может подать заявление не обязательно против кого-то, а, например, обратиться в суд за разрешением, или довести до сведения суда какую-то информацию.
Заявитель может также участвовать в судебном деле в качестве третьего лица, т.е. ни на стороне истца, ни на стороне ответчика.
In this case, complainant-истец подает заявление ПРОТИВ кого-то
claimant-заявитель может подать заявление не обязательно против кого-то, а, например, обратиться в суд за разрешением, или довести до сведения суда какую-то информацию.?
Не уверен?
I need your help,
Thanks

Turdimurod Rakhmanov (asker) Feb 4, 2023:

claimant and complainant https://thesaurus.plus/related/complainant/claimant
I need your help to make sure
https://www.proz.com/kudoz/russian-to-english/law-patents/33...

Turdimurod Rakhmanov (asker) Feb 4, 2023:

litigant I found, I think it is a litigant
claimant and litigant
claimant and complainant?

Turdimurod Rakhmanov (asker) Feb 4, 2023:

Claimer and claimant? I am thinking perhaps Claimer and claimant?