antepenúltimo
Antepenúltimo is a Spanish adjective meaning "third to last" or "the one before the penultimate." It is derived from the Latin prefix "ante-" meaning "before" and "paenultimus" meaning "second to last." In a sequence or series, antepenúltimo refers to the item that comes immediately before the penultimate item.
For example, in the sequence A, B, C, D, E, the last item is E, the penultimate
The concept of antepenúltimo can be applied to various forms of enumeration, including ordinal numbers, days