1. intercalary (concerning the maintenance or re-establishment of harmony between man-made systems of timekeeping and natural time cycles by adjusting the former to accord with the latter)

a. appended or interposed to a chronology to achieve such harmony (of a unit of time)

b. augmented by the insertion of shorter units of duration (such as days or months) in order to achieve such harmony (of a chronological system)

2. dividing (serving as a divider)

3. inserted, interposed