The quality or state of being doable; the feasibility or possibility of accomplishing or completing something.
From 'doable' (from 'do' plus '-able' suffix meaning 'capable of being') plus '-ity' suffix (meaning quality or state). This is a straightforward English word formation creating an abstract noun.
The word 'doability' sounds modern and business-like, but it's actually describing something timeless—whether something is possible—making it a perfect example of how English creates new words from simple roots to sound more professional!
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