đoan
[ʔɗwaːn˧˧]
In real, traceable use. Part of the curated seed collection; community review is coming.
Sense 1
Meaning · English
(adverb) for sure, certainly
Where it’s used:
Used
Toàn quốc & hải ngoại · Vietnam-wide & diaspora
Examples
Cái bản kiến nghị ký tên đồng loạt của các trò học sinh Ban Tú tài tôi đoan chắc cũng là chủ trương của Cộng sản.That petition the students of my Baccalaureate school so massively signed is certainly also a policy of the Communists.
Wiktionary example (CC BY-SA 4.0)
Sources & notes
Imported from Wiktionary (CC BY-SA 4.0, retrieved 2026-07-29); community review pending. source ↗
Sense 2
Meaning · English
(noun) customs (service/authorities/administration) under French colonial authority
Common questions
What does “đoan” mean?
(adverb) for sure, certainly
Is “đoan” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.