Eighth (adjective)

1. Constituting number eight in a sequence.
2. One of eight equal parts of a whole.

Origin:

From middle english eightethe, eȝtethe, ahtoða, from old english eahtoda, eahtodaþa, æhtaþa, from proto-germanic *ahtôþô (“eighth”), from *ahtô (“eight”), from proto-indo-european *oḱtṓw (“eight”).

Examples:

1. The eighth grade students are preparing for high school.
2. The company is celebrating its eighth anniversary.
3. The book is divided into eight chapters.
4. The recipe calls for one eighth of a teaspoon of salt.
5. The house is located on the eighth block of the street.