The quality of being able to be seen as a complete whole or overview; comprehensibility as a unified view.
From conspectus (a viewing) + -ity (a suffix creating nouns expressing states or qualities). This is an extremely rare word combining Latin roots to express 'the state of being viewable as one thing.'
This might be the most obscure word on this list—it's so rare that most dictionaries don't even include it, yet it follows perfectly standard English word-building rules: taking a Latin noun and adding -ity to make an abstract quality.
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