ility
ility is a productive noun-forming suffix in English used to express a quality, state, or degree associated with the base word. It attaches to adjectives (and sometimes other stems) to create abstract nouns such as fragility, stability, mobility, viability, feasibility, visibility, and utility. The -ility ending comes from Latin -ilitas and entered English via Old French -ilité, becoming one of the common ways to derive nouns from adjectives.
In usage, -ility nouns often denote an inherent characteristic or a capacity or potential under certain conditions.
Phonology and spelling typically render the suffix as -ility, with the final pronunciation often /-ɪlɪti/ and