The Chinese word "合理" is formed by combining two characters: "合", which means to join, harmonize, or be in accordance with, and "理", which refers to reason, principle, or logic. When these characters are merged, they create a compound where the literal sense of "combining reason" evolves into the abstract concept of aligning with logic or fairness, thus meaning "reasonable" or "rational". This structure illustrates how Chinese often constructs words by uniting meaningful components to convey integrated ideas.