NOUN (2)

1. a boyish or immature man; after the boy in Barrie's play who never grows up;

2. the main character in a play and novel by J. M. Barrie; a boy who won't grow up;

WordNet (r) 3.0 (2006):

Peter Pan
    n 1: a boyish or immature man; after the boy in Barrie's play
         who never grows up
    2: the main character in a play and novel by J. M. Barrie; a boy
       who won't grow up