The noun circular has 1 sense (no senses from tagged texts)
1. circular, handbill, bill, broadside, broadsheet, flier, flyer, throwaway -- (an advertisement (usually printed on a page or in a leaflet) intended for wide distribution; "he mailed the circular to all subscribers")
Overview of adj circular
The adj circular has 3 senses (first 1 from tagged texts)
1. (7) round, circular -- (having a circular shape)
2. annular, annulate, annulated, circinate, circular, ringed, ring-shaped, doughnut-shaped -- (shaped like a ring)
3. circular, rotary -- (marked by or moving in a circle)