'invitational' definitions:

Definition of 'invitational'

From: WordNet
adjective
Pertaining to or characteristic of an invitation

Definition of 'invitational'

From: GCIDE
  • invitational \invitational\ adj. open only to persons issued an invitation; -- of gatherings, usually sports events; as, an invitational tournament.
  • Syn: invitation(prenominal). [WordNet 1.5]