The quality or state of being convenient; usefulness, accessibility, or the degree to which something is easy to use or access.
From 'convenient' (Latin 'conveniens,' fitting) plus the noun suffix '-ness,' creating an abstract noun that describes the property of being convenient.
The '-ness' suffix is remarkably productive in English—you can add it to almost any adjective to capture its essence as an abstract quality, which is why 'convenientness' instantly makes sense even though 'convenience' is more common!
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