Quiddity/ˈkwɪdəti/ Definition 1 of 3Pro Tip 1/3Context Matters Use 'quiddity' in academic or philosophical discussions to sound insightful. The professor challenged us to find the quiddity of existentialism. Pro Tip 2/3Grasp Complexity Use when simplifying complex notions may overlook the essence of a thing. A biologist may explain the quiddity of an ecosystem. Pro Tip 3/3Avoid Casual Use Fits better in formal writing than everyday conversation due to its weightiness. In her thesis, she explored the quiddity of social media trends.