In this Part, unless the contrary intention appears:
"group member" means a member of a group of persons on whose behalf a representative proceeding has been commenced.
"representative party" means a person who commences a representative proceeding.
"representative proceeding" means a proceeding commenced under section 33C.
"respondent" means a person against whom relief is sought in a representative proceeding.
"sub-group member" means a person included in a sub-group established under section 33Q.
"sub-group representative party" means a person appointed to be a sub-group representative party under section 33Q.