100th

100th is the ordinal form of the number 100. It is written with the suffix -th after the numeral (100th) or as "the hundredth" when spelled out. The term denotes the position following 99 items in a sequence and is used to describe ranks, editions, anniversaries, and other ordered items. The related cardinal is one hundred, and the fractional form is one hundredth (1/100).

In mathematics and measurement, one hundredth refers to the fraction 1/100, equal to 0.01 in decimal form. The phrase also appears in expressions such as the 100th percentile, which in statistics marks the value below which 100 percent of observations fall; in practice the 100th percentile is commonly associated with the maximum value in a data set. The 100th root is another mathematical concept.

In calendar and time, the 100th day of a year is April 10 in non-leap years and April 9 in leap years. The 100th anniversary is called a centennial; centennial celebrations mark 100 years since a starting point. The term century is derived from Latin centum, meaning hundred, and the Roman numeral for 100 is C.

Examples of usage include the 100th episode, the 100th edition, or the 100th running of an event. The form and meaning are similar across contexts, with the precise interpretation determined by the noun it modifies.

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