The word 专家 (zhuānjiā) is formed by combining two meaningful characters to create a new concept. The first character, 专 (zhuān), carries the core idea of "specialization" or "focusing on one thing". The second character, 家 (jiā), literally means "home" or "household", but in this context, it extends to mean a person or master deeply associated with a particular field or practice, much like how a household is a dedicated domain. Thus, when fused, they conceptually depict a person whose "home" or realm is a specialized area of knowledge, elegantly forming the meaning of "expert".