The quality or state of being deistical; the characteristic nature of deism or adherence to deistic principles.
Deistical plus the noun-forming suffix '-ness,' which creates abstract nouns describing qualities or states. This word allows the expression of deistic philosophy as an abstract concept.
This word is so formal and lengthy that it appears almost exclusively in 18th-century academic writing—it's like philosophers were trying to make their ideas sound as weighty as possible!
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