thành niên
[tʰajŋ̟˨˩ niən˧˧]
In real, traceable use. Part of the curated seed collection; community review is coming.
Sense 1
Meaning · English
(adjective) adult; major
Where it’s used:
Used
Toàn quốc & hải ngoại · Vietnam-wide & diaspora
Sources & notes
Imported from Wiktionary (CC BY-SA 4.0, retrieved 2026-07-29); community review pending. source ↗
Sense 2
Meaning · English
(adjective) 18 years old or older
Examples
chưa/vị thành niên17 or younger; minor; underage
Wiktionary example (CC BY-SA 4.0)
Common questions
What does “thành niên” mean?
(adjective) adult; major
Is “thành niên” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.