'Centennial State' definitions:

Definition of 'Centennial State'

From: WordNet
noun
A state in west central United States in the Rocky Mountains [syn: Colorado, Centennial State, CO]

Definition of 'Centennial State'

From: GCIDE
  • Centennial State \Centennial State\ Colorado; -- a nickname alluding to the fact that it was admitted to the Union in the centennial year, 1876. [Webster 1913 Suppl.]