What does CIRCLE mean?

noun

1. ellipse in which the two axes are of equal length; a plane curve generated by one point moving at a constant distance from a fixed point“he calculated the circumference of the circle”
2. an unofficial association of people or groups“the smart set goes there”
3. something approximating the shape of a circle“the chairs were arranged in a circle”
4. movement once around a course“he drove an extra lap just for insurance”
5. a road junction at which traffic streams circularly around a central island“the accident blocked all traffic at the rotary”
6. street names for flunitrazepan
7. a curved section or tier of seats in a hall or theater or opera house; usually the first tier above the orchestra“they had excellent seats in the dress circle”
8. any circular or rotating mechanism“the machine punched out metal circles”