FromAinu +‎-ness.

Ainuness (uncountable)

1. The quality of beingAinu.
   • 2008, Kate Barclay,A Japanese Joint Venture in the Pacific, page46:

     According to Japanese stereotypes, for the Ainu to become fully part of the Japanese nation they had to modernize, which was defined as losing theirAinuness and becoming Japanese.

• English terms suffixed with -ness
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