Another variant form meaning relating to episodes or having the character of separate, disconnected incidents.
From episode + -ial (Latin-influenced adjectival suffix, an alternate form of -al). This represents competing suffix preferences in English borrowed terminology during the 16th-17th centuries.
English has at least three ways to say 'episode-related' (episodal, episodial, episodic), showing how our language inherited competing suffix systems from different Romance languages!
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