nonary

[noh-nuh-ree]
noun, plural no·na·ries.
  1. a number in a nonary system.

Origin of nonary

1660–70; < Latin nōnārius of, belonging to the ninth (hour), equivalent to nōn(us) ninth + -ārius -ary
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018