The quality of being fair, just, and reasonable; the state of treating all people or things with equal consideration and fairness.
From 'equitable' (Latin 'equitas' meaning fairness/equity) + '-ability' suffix. The noun form emerged in English legal and moral philosophy to describe the principle of fair treatment.
Equitability is the reason we have judges and courts—they're supposed to apply laws with equitability so rich and poor people get the same justice. In Medieval England, 'equity' courts developed specifically to fix cases where strict law was unfair!
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