/ɛksˈsaɪ/; /ˈɛksi/; /ˈɛksɪ/; /ˈzɪsi/ (XCI is typically read as ‘ninety-nine’), /ˈɪkˈsi/ (Latin)

Definitions

1. noun

The Roman numeral for ninety-nine.

“The ancient Roman manuscript was written in the numeral xci.”

2. adjective

Being in the Roman numeral for ninety-nine; nineteenth in a sequence of a hundred.

“The xci edition of the book was a bestseller.”