载入 (zǎi rù) is a formal verb meaning 'to enter into (a record or history)' — it emphasizes the act of officially documenting, inscribing, or enshrining something in a lasting, authoritative source such as historical records, official archives, or canonical texts. The first character 载 (zǎi) means 'to record' or 'to document' (as in 年鉴 niánjiàn 'yearbook' or 史载 shǐ zǎi 'recorded in history'), while 入 (rù) means 'to enter' or 'to be incorporated'. Together, they convey the idea of something being formally admitted into an enduring body of knowledge or memory.

This term is commonly used in academic, historical, and institutional contexts — for example, when describing how events, figures, or achievements become part of official historiography or national memory. It carries a sense of permanence and significance: only notable or verified matters are said to be 载入 history or 载入史册. It is rarely used in casual speech and almost never with everyday objects or trivial actions.