The quality or state of being allegorical; the degree to which something uses allegory or symbolism.
From 'allegorical' plus the suffix '-ness' (from Old English), which creates abstract nouns describing qualities. This noun describes the quality of being allegorical.
The '-ness' suffix is English's favorite way to turn adjectives into abstract nouns—'happy' → 'happiness,' 'dark' → 'darkness'—and 'allegoricalness' shows this pattern, though we usually just say 'allegory' instead!
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