'xl' definitions:

Definition of 'xl'

From: WordNet
adjective
Being ten more than thirty [syn: forty, 40, xl, twoscore]
noun
The cardinal number that is the product of ten and four [syn: forty, 40, XL]

Definition of 'xl'

From: GCIDE
  • xl \xl\, adj.
  • 1. the Roman number symbolizing the value forty.
  • Syn: forty, 40, twoscore. [WordNet 1.5]