universe in WordNet English dictionary

1. everything that exists anywhere
   "they study the evolution of the universe"; "the biggest tree in existence"
   universe  existence  creation  world  cosmos  macrocosm 
   
2. (statistics) the entire aggregation of items from which samples can be drawn
   "it is an estimate of the mean of the population"
   population  universe 
   
3. everything stated or assumed in a given discussion
   universe  universe of discourse