The word 专业 is formed by combining two characters, each contributing a core concept to create a new, unified meaning. The first character, 专 (zhuān), carries the idea of concentration, specialization, or focus on one thing. The second character, 业 (yè), represents a trade, profession, or field of work. When fused, they synthetically create the concept of a "specialized field" or "major discipline", where 专 modifies 业 to specify a profession defined by its focused, expert knowledge rather than general work.