8th

8th is the ordinal form of the number eight in English. It is used to indicate position in a sequence and is written as 8th when using numerals, or as eighth when spelled out. As an ordinal, it contrasts with the cardinal eight and appears in dates, lists, rankings, and addresses.

The standard method for forming English ordinals adds the suffix -th to the cardinal number. For eight, this yields eighth. The corresponding abbreviated form is 8th. In full spelling, it is eighth; the pronunciation centers on the first syllable of eight, followed by the th ending.

Common uses include dates (the 8th of a month), street and avenue designations (8th Street, 8th Avenue), and rankings (8th place in a competition). In legal and formal references, the 8th Amendment or the 8th Circuit Court of Appeals would be written with the numeral followed by the ordinal suffix, or spelled out as the Eighth Amendment when written in full.

In cultural contexts, the term appears in music and mathematics as well. In music, the octave is related to the concept of repeatedly dividing an interval into eight parts, and the term "8th note" can be used to describe rhythmic values in notation. In mathematics and computing, 8th is simply the position of the number eight in ordered sequences, and is used to denote the eighth item in lists or steps.

Overall, 8th serves as a standard ordinal indicator across dates, addresses, rankings, legal references, and other ordered contexts, with its spelling reflecting common English rules for forming ordinals from cardinals.