Origin of intercalation
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for intercalation
Consequently, the Intercalation and suppression of lunar months.
They divide the year into twelve months of thirty days, and add five days by intercalation.
Intercalation of freshwater beds and of boulder clay and sand at Mundesley.A Manual of Elementary Geology
Whenever the intercalation is made there must necessarily be a change in the dominical letter.
Had he done so it would now fall on the 24th, by adopting the Gregorian rule of intercalation.
Word Origin and History for intercalation
1570s, from Latin intercalationem (nominative intercalatio) "insertion of an intercalary day," noun of action from past participle stem of intercalare (see intercalate).
Online Etymology Dictionary, © 2010 Douglas Harper