The Vietnamese word "bách chu niên" refers to a "centenary," which is a term used to describe the 100th anniversary of an event or the completion of a hundred years. It can be used to celebrate or commemorate important historical events, such as the founding of a city, the establishment of an institution, or the birth of a notable person.
While "bách chu niên" specifically refers to a centenary, it is important not to confuse it with other time-related words.