The word “primary” has several common meanings in English, depending on context:

• Main or most important: the primary goal, primary concern
• First in order or development: the primary stage of a process
• Elementary or basic: primary education refers to elementary school
• Original or earliest: primary source, primary color (in art/physics contexts)

If you’re asking about a specific usage or language context (for example, translating to Chinese, or how it differs from related terms like chief, main, or elementary), tell me the exact sentence or scenario and I’ll tailor the explanation.