Fromnon- +‎accession.

nonaccession (uncountable)

1. (often attributive) Absence of accession.
   • 2001, Ranbir Vohra,The Making of India: A Historical Survey, page164:

     Surprisingly, even the Muslim League rejected the proposals, its objection being that the terms ofnonaccession did not, unequivocally, accept the partitioning of India and the establishment of an independent Muslim state;[…]

   • 2007, Marios I. Katsioloudes, Spyros Hadjidakis,International Business: A Global Perspective, page222:

     For example, Romania, anonaccession country, ranks among the top five in the region.

• English terms prefixed with non-
• English lemmas
• English nouns
• English uncountable nouns
• English terms with quotations

• Pages with entries
• Pages with 1 entry
• Quotation templates to be cleaned