A way to hold this word: a government picks a handful of people and sends them away to live in another country and speak for home. That small sent-out group is the heart of the word. They need somewhere to sit, so they take a house with a flag over the door — and before long people point at the house and call it by the group's name too.
From the word’s history
The supplied entry takes legation from Latin legatio, the act of sending someone out, the same root that gives legate, the person sent. The sending comes first; the group and then their house take their name from it.
來源說 legation 出自拉丁文 lēgātiō，意思是「派遣出去」這件事，跟 legate（被派出去的使節）同一條根。先有「派出去」，才有被派出去的那群人，最後連他們的房子也沿用了這個名字。
Wiktionary entry for legation (noun), source_ref kaikki:3f6f69a190036ae4:1186721443, supplied in this packet
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