Picture a door, and someone standing at it waiting to be led in. Induct is the leading-in: a person or a body with the right to do it takes you across the line, and after that you are inside. The Latin behind the word is in- meaning in, plus ducere meaning to lead. What lies inside the door changes from sense to sense — an office, a wall of honoured names, an army, the habits of a trade — but the picture holds every time. It is formal. Someone else does it to you, which is why the passive be inducted into is so common. And it is usually one marked moment rather than a slow change.
From the word’s history
Wiktionary dates the word to 1350–1400, from Middle English induct, borrowed from Latin inductus, the perfect passive participle of indūcō — literally led in. The modern senses all keep that leading-in.
Wiktionary 把這個字追到 1350–1400 年的中古英語 induct，來自拉丁文 inductus，也就是 indūcō 的過去分詞，字面就是「被領進去的」。今天的每一個意思都還留著這個「領進去」。
Wiktionary entry for induct, packet etymology_text (source_ref kaikki:3f6f69a190036ae4:618521134)
登入就可以看每一支怎麼連回核心畫面。