What is the meaning of đồng?

Uncommon spelling of dong (Vietnamese currency).

dong (the currency of Vietnam; usually used by thousands or higher denominations)

field (clearly delimited land area free of woodland, cities, and towns)

a medium

Norman, Jerry; Mei, Tsu-lin (梅祖麟) (1976), “The Austroasiatics in Ancient South China: Some Lexical Evidence”, in Monumenta Serica, issue 32, pages 274–301

Sagart, Laurent (2008). "The expansion of Setaria farmers in East Asia: a linguistic and archaeological model". In: Sanchez-Mazas, A.; Blench, R.; Ross, M. et al. (eds.), Past Human Migrations in East Asia: Matching Archaeology, Linguistics and Genetics. London: Routledge, 133–157.

copper

dong (currency of Vietnam)

a thousand dongs

dong (currency of South Vietnam)

a currency

co-; united

homo-; same

Source: wiktionary.org