1 circular /ˈsɚkjəlɚ/ adjective
1 circular
Learner's definition of CIRCULAR
[more circular; most circular] : shaped like a circle or part of a circle
: moving or going around in a circle
[more circular; most circular] : incorrectly using a statement that may not be true to prove an idea or thought that would be false if the original statement was not true

— circularity

/ˌsɚkjəˈlerəti/ noun [noncount]
2 circular /ˈsɚkjəlɚ/ noun
plural circulars
2 circular
plural circulars
Learner's definition of CIRCULAR
: a printed sheet (such as an advertisement) that is given or sent to many people at the same time