'xviii' definitions:

Definition of 'xviii'

From: WordNet
adjective
Being one more than seventeen [syn: eighteen, 18, xviii]
noun
The cardinal number that is the sum of seventeen and one [syn: eighteen, 18, XVIII]

Definition of 'xviii'

From: GCIDE
  • xviii \xviii\, adj. The Roman number symbolizing the value eighteen.
  • Syn: eighteen, 18. [WordNet 1.5]