The state or quality of being governable; the capacity to be controlled or managed.
From 'governable' (adjective) plus '-ness', which converts adjectives into nouns representing their abstract qualities or states.
This word is a 'double suffix' construction—'govern' becomes 'governable' (add -able), which becomes 'governableness' (add -ness)—it shows how English loves to build bigger words from smaller pieces!
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