請願人,訴願人,原告
Petitioner \Pe*ti"tion*er\, n. One who presents a petition.
petitioner n 1: one praying humbly for something; "a suppliant for her favors" [syn: {suppliant}, {supplicant}] 2: someone who petitions a court for redress of a grievance or recovery of a right [syn: {suer}]