The quality or condition of lacking a front; the state of being without a forward-facing surface.
From 'frontless' (adjective) + '-ness' (suffix forming abstract nouns from adjectives). This follows productive English nominalization patterns.
Nominalizing adjectives with '-ness' (like 'sadness,' 'kindness,' 'frontlessness') lets us discuss abstract qualities as concrete things, which is why philosophers and scientists love this suffix—it lets them talk about properties as if they're objects.
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