Intercalation

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intercalation

[in‚tər·kə′lā·shən]
(geology)
A layer located between layers of different character.

Intercalation

 

the appearance of new structures and processes in an already formed life system. Examples of intercalation are the articulation of new stages alongside already existing ones in the process of individual development, the formation of secondary venules between the main ones in the wings of insects, and the formation of additional silica in diatomaceous algae.

References in periodicals archive ?
Complicating matters even further, every few years an extra leap month is added to the Chinese calendar.
Unlike other calendar systems that use leap days or leap months to synchronise the calendar with the solar year, the Islamic calendar is completely detached from astronomical seasons marked by the equinoxes and solstices.