Imitation.

Since antiquity, the term 'imitation' has been used promiscuously in biology and everyday life. Anything that makes some individuals look or act like others has been called imitation, from the evolutionary process that makes edible butterflies look like their inedible cousins (better known as Batesian mimicry), to the rag-bag of psychological processes that make people wear similar clothes, eat in the same restaurants, and use the same gestures for communication.