a transitional person: someone who will bridge ...
bridge the gap between the old life ... Traditionally, a transitional person has been thought of as a lover who is ...
http://books.google.com/books?id=_HfG94gUkIsC&pg=PA37&lpg=PA37&dq=transitional+person&source=bl&ots=YEr_hslqoR&sig=gikTtR2EiZw9EkVrAQ-OFPRZIYw&hl=en&ei=cq3aScPsCuaGmQf4uJGwCA&sa=X&oi=book_result&ct=result&resnum=7
So, transitional person already has its special meaning