An archaic or variant form of atomistic; relating to atomism or atomic philosophy.
From atomistic + -al (archaic adjective suffix variant). An older form that competes with the simpler 'atomistic,' following a pattern common in older English.
Language evolves toward simpler forms—'atomistical' lost to 'atomistic,' just like 'majestical' became 'majestic,' showing how English gradually trims unnecessary letters.
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