availability

The word 'availability' is a modern English formation built upon the older verb 'avail', which entered English from Old French in the 13th century. The French term 'availer' itself descended from the Latin phrase 'ad valere', literally meaning "to be of worth". The suffix '-ability' is a productive English morpheme derived from Latin, used to transform adjectives ending in '-able' into abstract nouns denoting a state or condition. Therefore, the literal construction "the quality of being able to be of use" logically evolved into the contemporary meanings concerning accessibility, obtainability, and the state of being free or ready for service.

Structure: avail (use, benefit) + ability (capacity, quality) - avail: From Old French 'a' (to) + 'valoir' (be worth), from Latin 'valere' (to be strong, be worth). Functions as the verb root meaning "to be of use or value". - ability: From Latin '-abilitas', a suffix forming nouns of quality or state, from '-abilis' (able to be) + '-itas' (noun suffix). Functions as a noun-forming suffix indicating "the quality or state of being".