What is the Spanish term for "Day"?

The Spanish term for "Day" is "Día." This word is foundational in the language, as it is used to refer to a 24-hour period during which the sun rises and sets, thus marking the traditional cycle of night and day. In various contexts, "Día" can be used in expressions related to time, dates, and daily activities, making it a common and important term in everyday conversation.

The other terms provided in the list do not have the same meaning. For example, "Hora" translates to "Hour," which quantifies a shorter segment of time than a day. "Fianza" means "bail" or "guarantee," which is unrelated to the concept of time. Lastly, "Documentos" translates to "documents" and does not pertain to temporal terms. Therefore, "Día" is the accurate translation for "Day" in Spanish.