twelfth
num.num. the position of number twelve in a series. You use it to describe the person or thing that comes after the eleventh.
num. constituting number twelve in a sequence; the ordinal form of the number twelve.
He finished in twelfth place out of fifty runners.
The office is located on the twelfth floor of the building, right above the cafeteria.
In music theory, a compound interval spanning an octave and a perfect fifth is referred to as a perfect twelfth, representing a frequency ratio of three to one.
From Middle English twelfthe, twelfte, from Old English twelfta (“twelfth”), from Proto-Germanic *twaliftô (“twelfth”), equivalent to twelve + -th (ordinal suffix). Cognate with Scots twalt (“twelfth”), Saterland Frisian tweelfte (“twelfth”), West Frisian tolfde (“twelfth”), Dutch twaalfde (“twelfth”), German Low German twalfde, twalvde (“twelfth”), German zwölfte (“twelfth”), Danish tolvte (“twelfth”), Swedish tolfte (“twelfth”), Icelandic tólfta (“twelfth”).
As an ordinal number, it is frequently preceded by the definite article 'the'.
twelvethtwelfthThe 'v' in 'twelve' changes to an 'f' and the 'e' is dropped when forming the ordinal number.