nonary

[ noh-nuh-ree ]
/ ˈnoʊ nə ri /

adjective

consisting of nine.
of, relating to, or noting a numerical system based on the number 9.

noun, plural no·na·ries.

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