intercalate

 
Pronunciation: /ɪnˈtəːkəleɪt, ˌɪntəkəˈleɪt/

verb

[with object]
  • 1insert (an intercalary period) in a calendar: a system was introduced to intercalate an extra month in the calendar
  • 2insert (something) between layers in a crystal lattice, geological formation, or other structure: (as adjective intercalated) the interlayer spaces of the graphite host lattice are filled with intercalated layers

Derivatives

intercalation

Pronunciation: /-ˈleɪʃ(ə)n/
noun

Origin:

early 17th century: from Latin intercalat- 'proclaimed as inserted in the calendar', from the verb intercalare, from inter- 'between' + calare 'proclaim solemnly'