'Petitioner' definitions:

Definition of 'petitioner'

From: WordNet
noun
One praying humbly for something; "a suppliant for her favors" [syn: petitioner, suppliant, supplicant, requester]
noun
Someone who petitions a court for redress of a grievance or recovery of a right [syn: suer, petitioner]

Definition of 'Petitioner'

From: GCIDE
  • Petitioner \Pe*ti"tion*er\, n. One who presents a petition. [1913 Webster]