From Longman Dictionary of Contemporary Englishcircularcir‧cu‧lar1 /ˈsɜːkjələ $ ˈsɜːrkjələr/●くろまる●くろまる○しろまる adjective1CIRCLEshaped like a circlea circular table2AROUND/ROUNDmoving around in a circlea circular bus route3 →circular argument/logic/reasoning —circularity /ˌsɜːkjəˈlærəti $ ˌsɜːr-/ noun [uncountable]Examples from the Corpuscircular• The level I have in mind is circular.• Attached to one side was an enormouscircularblade; a startlingsilver against the gloom.• The interior of the circular cella is a masterpiece of construction and lighting effect.• The villa has a circularcourtyard with rooms leading off it in all directions.• The cattle are kept in a large circularenclosure.• The frigidarium is small and circular in plan.• Rather, I think the measure should be circular, like the face of a clock.• With shoes off, make a circularmotion with the feet to the count of 10, Levi suggested.• the moon's circularorbit• The planets follow almost circular orbits around the sun.• The procession follows a circularroute through the town, and finishes back in the park.• Hold up the circularstrip and ask the students how many sides it has.Related topics: Newspapers, printing, publishingcircularcircular2 noun [countable]TCNa printedadvertisement, notice etc that is sent to lots of people at the same timeExamples from the Corpuscircular• It is not a circularslipped under your door to which you may or may not respond with a pre-paid envelope.• Central Government publish general advice on a widerange of planning issues through planning policyguidancenotes and circulars.• Publishers often distribute, in addition to catalogues, circulars about individual books or series.• The Patten plan, detailed in a Government draftcircular, risksfurtherheighteningconfrontation with teachers already boycottingnationalcurriculumtests.• Still, make sure that it's mentioned in the next circular, lad.• Roboticbureaucrats do not look through the Sunday shopping circulars to find the lowest prices.• In view of the threat of expulsionscontained in these circulars, Laboursupporters of Unity had to reconsider their position.From Longman Business Dictionarycircularcir‧cu‧lar /ˈsɜːkələˈsɜːrkjələr/ noun [countable]MARKETINGan official letter or advertisement sent to a lot of peopleThe government’s instructions were issued to local authorities via circulars.a circular letter sent out by one insurance company, urging people to ‘Act Now And Beat The Tax Man’Origincircular1(1300-1400)Old Frenchcirculer, from Late Latincircularis, from Latincirculus; → CIRCLE1