Origin: Germanic Old English suffix
Holiness has 3 different meanings across 1 category:
the quality of being holy
"The quiet reverence she felt while walking through the ancient cathedral was a profound sense of holiness that seemed to fill every stone and beam."
The state or condition of being holy.
"When addressing the pontiff, you should refer to him as Holiness rather than by his personal name."
Used in connection with His or Your to address the pope.