This is the 472nd most frequent Vietnamese word.
kỷ
The Vietnamese word "kỷ" can mean "discipline," "self-control," "era," or "small table/shelf," depending on context.
kỷ vật (souvenir) is used to indicate memorabilia or keepsakes.
Tôi vẫn giữ gìn những kỷ vật của tuổi thơ.
I still treasure souvenirs from my childhood.
kỷ luật (discipline) refers to strict behaviors or standards.
Anh ấy luôn cư xử rất kỷ luật.
He always behaves very disciplined.
thế kỷ (century) is a time period of 100 years.