Final answer:
Cultural diffusion is the process through which distinct cultures merged and spread across different regions prior to 1500 CE, influencing various aspects of society.
Step-by-step explanation:
The process described in the question is called cultural diffusion. Cultural diffusion refers to the spread and blending of ideas, beliefs, customs, and practices across different cultures as a result of trade, travel, and interaction. Prior to 1500 CE, various cultures had contact and influenced each other through these means, leading to the merging and spread of cultural elements. This process played a significant role in shaping the world we live in today, impacting areas such as religion, politics, education, science, and more.