"Bissextile" is a word that refers to a leap year, adding an extra day (February 29th) to the calendar in order to balance out the different lengths of the solar and calendar year. However, there are a variety of synonyms one can use to make their writing more dynamic. For example, one could use the phrase "intercalary year", "an embolismic year", or simply "leap year". Additionally, one could combine terms to provide additional context or description, such as "the 366-day year", "the additional day year", or "the year of the double Feb." No matter the phrasing, all of these synonyms describe the same unique calendar phenomenon.