The act or process of moving in a circle or circuit; a journey around something.
From Latin circuire (to go around) plus the abstract noun suffix -tion. This Latinate word formation creates an abstract noun describing the action of circulating.
Latin verbs ending in -ire become English nouns ending in -tion: circuire becomes circuition, munire becomes munition. These weren't invented yesterday; they're centuries-old linguistic formulas still working today.
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