(Wicca) A ritual circle that is cast three times deosil and closes three times widdershins either in the air with a wand or literally with stones or other items used for worship.
“The full extent of FIFA's stance was revealed in a circular sent out yesterday to all national associations and will apply immediately.”
circulator
A person or thing that causes something to circulate
(transport) A local transit system that provides regular service within a closed loop
(electronics) A passive electronic component with three or more ports, in which the ports can be accessed in such a way that when a signal is fed into any port it is transferred to the next port only
“The conversation was taking on the kind of circularity I've experienced in arguments with religious zealots.”
“Arresting in their circularity, these poems achieve a primeval force that is like some great lost original rhythm.”
“What if it was expressive of the redundancy of these men's thoughts, their emptiness and circularity?”
circulatory
(chemistry) A vessel with two portions unequally exposed to heat, and with connecting pipes or passages, through which the fluid rises from the overheated portion, and descends from the relatively colder, maintaining a circulation.