1) Actor in first role 2) French word used in English 
• Alt. of Debutante
Dé`bu`tant' noun ; fem. Dé`bu`tante' [ French, present participle of débuter to have the first throw, to make one's début . See Début .] A person who makes his (or her) first appearance before the public. 
a person who makes a debut into a professional career or before the public.