of circles; having the form of a circle
moving in or describing a circle or spiral
circuitous
marked by the fallacy of assuming something which is to be demonstrated
circular arguments
marked by or moving in a cycle
said of a letter or advertising material: intended for circulation to a number of people, e.g. by mail
circularity /-ʹlariti/ noun
circularly adv
[Middle English circuler via French from late Latin circularis, from Latin circulus: see circle1]