circularity          
noun [ U ] uk/ˌsɜː.kjəˈlær.ə.ti/ us/ˌsɝː.kjəˈler.ə.t̬i/
 循环性
the fact of constantly returning to the same point or situation
  the circularity of political arguments 政治争论的循环性 
 Scholars have frequently noted the circularity of the 19th-century rule that a promise is not binding unless given in exchange for a binding promise. 学者们经常注意到十九世纪规则的循环性,即除非以有约束力的承诺作为交换,否则承诺是没有约束力的。 
  圆,圆形(性),环形(性)
the fact of being shaped like a circle
  I'd see a stone with just the right qualities of flatness, circularity, and weight.  我会看到一块石头,它的平整度、圆度和重量都恰到好处。 
 The sloping site and emphasis on circularity gives the garden a feeling of space. 倾斜的场地和对圆形的强调使花园有了一种空间感。 
 See: circular
 - More examples
 - The story has an almost too-perfect circularity to it.
 - By then her career was taking on a certain bleak circularity: just as Strangers on a Train had been rejected by six publishers at the start, so her final novel was rejected.
 - The wheel was ground to perfect circularity.
 - The lack of perfect circularity of the Earth's orbit is known as its eccentricity.