intercalary

/ɪnˈtɜːrkəˌlɛri/
adjective
  1. (of a day or month) inserted into a calendar to make the calendar year match the solar year.
    • February 29 is an intercalary day added during leap years.
    • Intercalary days help keep our modern calendar accurate.
    • The ancient Roman calendar used an intercalary month to stay aligned with the seasons.
  2. Inserted or added between other elements; extra or intervening.
    • The intercalary scenes in the movie provided comic relief between the dramatic parts.
    • In some plants, intercalary growth occurs between the tip and the base of the stem.
    • The book includes an intercalary chapter that explains the historical background.
Synonyms
What does "intercalary" mean? | whatsthatwordmean | whatsthatwordmean