The Collaborative International Dictionary of English v.0.48:

Weltanschauung \Welt"an"schau`ung\, n.; pl. Weltanschauungen.
   [G.]
   Lit., world view; a conception of the course of events in,
   and of the purpose of, the world as a whole, forming a
   philosophical view or apprehension of the universe; the
   general idea embodied in a cosmology.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

Weltanschauung
    n 1: a comprehensive view of the world and human life [syn:
         Weltanschauung, world view]