Definition of "intercalate" [in•ter•ca•late]

• To insert (a day or month) in a calendar. (verb-transitive)
• To insert, interpose, or interpolate. (verb-transitive)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "I think it is necessary that the indian people, of which I am a member, should contribute with its science and its knowledge to human development because we have enormous potentials and we could intercalate our very ancient heritage with the achievements of the civilization in Europe as well as in other parts of the world."
• "R. Simai and R. Zadok went to intercalate the year in Lydda, and kept the Sabbath in Ono."
• ""They intercalate the year upon three accounts; for the green year, for the fruit of the tree, and for Tekupha.""