"circular" in the noun sense
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"
"circular" in the adjective sense
1. round, circular
having the shape or form of a circle
2. circular, rotary, orbitual
describing a circle moving in a circle
"the circular motion of the wheel"
Source: WordNet® (An amazing lexical database of English)
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