The quality or capability of being able to fly, especially regarding aircraft design and performance.
From 'fly' (Old English 'fleogan') + 'able' (from Latin 'habilis' meaning 'handy') + '-ity' suffix forming nouns of state. Modern technical term created to describe aeronautical feasibility.
Engineers use this term to measure whether a design can actually get off the ground—it's literally what determines if dreams of flight become reality or stay grounded.
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