Twelfth (adjective)

Being one of twelve in a set or series.

Origin:

Old english twelfða, from twelf 'twelve' + -ða, suffix forming ordinal numbers.

Examples:

1. The twelfth of the month is tomorrow.
2. Today is the twelfth day of the month.
3. The twelfth chapter of the book is about the history of the city.
4. The twelfth century was a time of great change and growth.
5. The twelfth season of the show is available on DVD.