The quality or state of being extortionate; the characteristic of being unreasonably excessive or exploitative.
From 'extortionate' plus '-ness' (suffix forming nouns from adjectives meaning 'the quality of'). Describes the abstract quality of being excessive.
The '-ness' suffix is wonderfully versatile—you can measure almost any adjective's qualities as a noun ('the redness of the apple,' 'the sadness of goodbye').
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