Relating to or of the nature of a circuit; forming or arranged in a circular path.
From circuit plus the adjectival suffix -al, forming an adjective. This technical term appears primarily in electrical engineering and mathematics to describe circuit-related properties.
Engineers use -al suffixes to turn nouns into adjectives: circuit becomes circuital, logic becomes logical. This pattern is so automatic that people rarely think about it, but it's one of English's most powerful meaning-making machines.
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