The locus of points in a chromaticity diagram that represents chromaticities of the radiation of planckian radiators at different temperatures 色度图中，表征不同温度下黑体辐射的色坐标的点的轨迹。
2.
The temperature of the planckian radiator whose perceived color most closely resembles that of a given stimulus at the same brightness and under specified viewing conditions 在特定条件下，亮度相同时，普朗克辐射体的感官颜色与给定的刺激值最为接近，则此时普朗克辐射体的温度被定义为相关色温。
