1. the quality or state of being circular in shape or form
2. a logical fallacy in which a conclusion is supported by a premise that itself depends on the conclusion; circular reasoning
Usage: logic, philosophy
3. the quality of moving in or forming a circle; cyclical motion or pattern

Examples

• The circularity of the planet makes it suitable for orbital mechanics.
• The argument fell into circularity when the author used the conclusion to prove the premise.
• The circularity of the seasons creates a predictable pattern of weather changes.
• Her reasoning had a fatal flaw: it was based on circularity rather than independent evidence.
• The circularity of the design gave the building an elegant, modern appearance.
• In mathematics, circularity refers to the property of curves that form perfect circles.