The term "twentieth" refers to the ordinal number that indicates the position of something in a sequence, specifically the number 20. It is commonly used to describe the order of items, such as the twentieth person in a line or the twentieth chapter in a book. In mathematics, it can also represent a fraction, as one-twentieth is equal to 1/20. In the context of time, "twentieth" can refer to the twentieth century, which spanned from the year 1901 to 2000. This century was marked by significant events, including two world wars and the rise of technology. The twentieth century saw major cultural shifts and advancements in various fields, including science, art, and politics.