adj. & n.
adj. 1 a having the form of a circle. b moving or taking place along a circle (circular tour). 2 Logic (of reasoning) depending on a vicious circle. 3 (of a letter or advertisement etc.) printed for distribution to a large number of people.
n. a circular letter, leaflet, etc. circular saw a power saw with a rapidly rotating toothed disc. circularity n. circularly adv.
[ ME f. AF circuler, OF circulier, cerclier f. LL circularis f. L circulus CIRCLE ]