The Collaborative International Dictionary of English v.0.48:
Newcomer \New"com`er\, n. One who has lately come. [1913 Webster]WordNet (r) 3.0 (2006):
newcomer n 1: any new participant in some activity [syn: newcomer, fledgling, fledgeling, starter, neophyte, freshman, newbie, entrant] 2: a recent arrival; "he's a newcomer to Boston"