circular in WordNet English dictionary

1. an advertisement (usually printed on a page or in a leaflet) intended for wide distribution
   "he mailed the circular to all subscribers"
   circular  handbill  bill  broadside  broadsheet  flier  flyer  throwaway 
   

1. having a circular shape
   round  circular 
   
2. describing a circle; moving in a circle
   "the circular motion of the wheel"
   circular  rotary  orbitual