Regularity means the quality of happening in a consistent, predictable pattern. When something occurs with regularity, it shows up at expected intervals, like how the school bus arrives at the same time each morning or how your family eats dinner together every evening at six o'clock.

You can see regularity in nature: the sun rises with perfect regularity each day, seasons change with regularity each year, and your heartbeat maintains its regularity as it pumps blood through your body. Athletes practice with regularity to improve their skills, showing up for training on a dependable schedule rather than whenever they feel like it.

The opposite of regularity is randomness or unpredictability. A friend who shows up with regularity is reliable and keeps their commitments. A friend who only appears occasionally, without any pattern, lacks regularity in their behavior.

The word can also describe evenness or uniformity in appearance. A brick wall built with regularity has straight lines and consistent spacing. In mathematics, a polygon with regularity (called a regular polygon) has all equal sides and angles, like a square or an equilateral triangle.