The quality of being able to be understood or grasped mentally.
From apprehensible + -ity suffix (converts adjectives to abstract nouns). Apprehensible comes from apprehend + -ible (able to be). The -ity ending comes from Latin -itas. This creates a double-suffixed noun three layers deep.
Philosophy professors use 'apprehensibility' when debating whether quantum mechanics is even theoretically understandable to humans—it's asking if reality itself can be grasped by finite minds!
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