Cách sử dụng
The word "eightieth" refers to the number 80 in a sequence. It is used to describe the position of something or someone in a list or series that has 80 items or people. For example, if someone is celebrating their 80th birthday, it means they have lived for 80 years, and this is their eightieth birthday. Similarly, if a book is the 80th in a series, it is referred to as the "eightieth book." The word is often used in formal writing or when discussing numerical sequences.