‘自然’ (zì rán) literally combines 自 (zì, 'self') and 然 (rán, an archaic suffix meaning 'so' or 'thus'), together conveying the idea of 'what is so of itself' — hence its core meanings: 'nature' as the physical world (mountains, rivers, animals, plants), and 'naturally' as something happening spontaneously, without artificial effort or force. As a noun, it often appears in contexts like environmental protection, ecology, or outdoor activities. As an adverb, it describes actions or states that occur effortlessly, authentically, or logically — for example, '他自然地笑了' (He smiled naturally).

This word carries a gentle, positive connotation — evoking harmony, authenticity, and balance. It’s frequently used in compound words like 自然界 (the natural world), 自然资源 (natural resources), and 自然语言 (natural language). Unlike more technical terms like 生态 (ecology), 自然 feels accessible and broadly applicable in both everyday speech and formal writing.