The word 入侵 is formed by combining two characters: 入 (rù), meaning "to enter", and 侵 (qīn), meaning "to invade" or "to encroach upon". The concept is constructed by logically sequencing these actions, first the act of entering, which is then qualified and intensified by the second character to specify a hostile, forceful, or unwelcome entry. Together, they create a single, integrated concept of "invasion", where the whole meaning is more specific and severe than the simple sum of its parts.