This is the 752nd most frequent Vietnamese word.
trưa
"Trưa" means "noon" or "midday" in English.
Here, 'trưa' is used as a noun to refer to the time of day in the middle of the day, around noon.
Tôi sẽ gặp bạn vào buổi trưa.
I will meet you at noon.
In this sentence, 'trưa' forms part of the compound noun 'bữa trưa', which means 'lunch'.
Bữa trưa hôm nay thật ngon.
Today's lunch was really delicious.
Here, 'trưa' is used as a noun to specify the time of day, indicating midday.