You can picture a federation as separate groups clasping hands under one shared agreement, so many bodies become one larger body while each still keeps its own shape.
From the word’s history
From Latin foedus (genitive foederis) "covenant, league, treaty": a federation is parts bound into one by a shared pact—the agreement is what holds them together.
字根 foedus（屬格 foederis）在拉丁文是「盟約、聯盟、條約」；federation 的核心比較像靠一紙共同的約定，把各個部分綁成一個整體——真正把大家綁在一起的，是那份約定。
etymonline.com/word/federation (< Late Latin foederare, from Latin foedus 'covenant, league')
登入就可以看每一支怎麼連回核心畫面。
原始詞典資料6 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
Federationname
- 1
A local government area (Federation Council (New South Wales)) in the Murray region of New South Wales, Australia.
federationnoun/ˌfɛdəˈɹeɪ̯ʃən/
- 1
An act of joining together into a single political entity.
- It is 106 years since federation.
- 2
An array of nations or states that are unified under one central authority.
- 3
Any society or organisation formed from separate groups or bodies.
- FIDE appeals to all chess players and federations to accept this view.
- 4
communicationscomputingelectrical-engineeringA collection of network or telecommunication providers that offer interoperability.
federationadj/ˌfɛdəˈɹeɪ̯ʃən/
- 1
Of an architectural style popular around the time of federation.
- We live in a federation house.
- The Federation house claimed a unique place in architecture, even if it offended architects.
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。