noun
Association of Southeast Asia
Historical organization name; refers to the Association of Southeast Asia (ASA), a short-lived regional grouping formed in 1961 that preceded ASEAN.
東南アジア連合は1961年に設立されたが、すぐにASEANに取って代わられた。
The Association of Southeast Asia was established in 1961 but was soon replaced by ASEAN.
ASEAN is the modern successor organization, while 東南アジア連合 refers specifically to the earlier Association of Southeast Asia (ASA).
Compound of 東南アジア (Southeast Asia) and 連合 (union, association).