👉 The word 'circle' means a perfect circle, which was not circular before our time. A 'circle' is defined as: 1. A round shape. It can be made by rolling out a square on its face. 2. Used for defining things in geometry and mathematics, such as circles in algebra or triangles in trigonometry. This word has different meanings depending on the context: - In geometry, it refers to an equilateral triangle (a 3-sided polygon with three equal sides and angles). - In mathematics, it's used to denote a circle.