adj. & n.
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.
Phrases and idioms:
circular saw a power saw with a rapidly rotating toothed disc.
circularity n. circularly adv.
Etymology: ME f. AF circuler, OF circulier, cerclier f. LL circularis f. L circulus CIRCLE