/ˈɛks aɪ/ (EX eye)

Definitions

1. noun

the 21st letter of the Roman alphabet

“The abbreviation ‘XXI’ represents the Roman numeral for the number 21.”

2. adverb

in the 21st position or place, or in the 21st century

“XXI century technology has greatly impacted modern life.”

3. adjective

relating to or characteristic of the 21st century

“XXI technology is revolutionizing the world today.”