The Collaborative International Dictionary of English v.0.48:

Ibsen \Ibsen\ prop. n.
   Henrik Ibsen (1828-1906), Norwegian poet and dramatist.

   Syn: Henrik Ibsen.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Ibsen
    n 1: realistic Norwegian author who wrote plays on social and
         political themes (1828-1906) [syn: Ibsen, Henrik Ibsen,
         Henrik Johan Ibsen]