The word **变换** (biànhuàn) is a compound term formed by combining two semantically similar characters: **变** (biàn), meaning "to change" or "alter," and **换** (huàn), meaning "to exchange" or "swap." Together, they create a synergistic meaning that is more nuanced than either character alone, specifically referring to a **transformation, conversion, or substitution** where one state or form is changed or exchanged for another. This formation follows a common pattern in Chinese where two characters with related meanings are paired to refine and solidify a specific concept, often used in technical, mathematical, and formal contexts (e.g., coordinate transformation, code conversion) to denote a systematic or fundamental change.