This is the 583rd most frequent Vietnamese word.
môn
"Subject" or "field of study."
In this sentence, 'môn' refers to 'subject', denoting an academic discipline or field of study.
Môn toán là một trong những môn học quan trọng nhất.
Mathematics is one of the most important subjects.
In this context, 'môn' refers to a discipline or category, specifically a martial art form.
Môn võ mang đến sức khỏe và sự tự vệ.
Martial arts bring health and self-defense.
Here, 'môn' is used to indicate a sport or game, specifying the type of sport involved.