prime¹/praɪm; praɪm/ adj 1 main or most important 首要的，主要的: Smoking is one of the prime causes of heart disease. 吸烟是导致心脏病的主要原因之一。 2 of the very best quality or kind 质量最佳的，第一流的: a house in a prime location 处于一流地段的房屋 3 a prime example a very good example of something 典型的例子