circular ( circulars plural )
1 adj Something that is circular is shaped like a circle.
usu ADJ n
...a circular hole twelve feet wide and two feet deep..., Place your hands on your shoulders and move your elbows up, back, and down, in a circular motion.
2 adj A circular journey or route is one in which you go to a place and return by a different route.
usu ADJ n
Both sides of the river can be explored on this circular walk.
3 adj A circular argument or theory is not valid because it uses a statement to prove something which is then used to prove the statement.
4 n-count A circular is an official letter or advertisement that is sent to a large number of people at the same time. The proposal has been widely publicised in BBC-TV press information circulars sent to 1,800 newspapers.
circular saw ( circular saws plural ) A circular saw is a round metal disk with a sharp edge which is used for cutting wood and other materials.
in AM, use buzzsaw
semi-circular , semicircular
Something that is semi-circular has the shape of half a circle. adj
...a semi-circular amphitheatre.
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"