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[in-tur-kuh-leyt] /ɪnˈtɜr kəˌleɪt/
verb (used with object), intercalated, intercalating.
to interpolate; interpose.
to insert (an extra day, month, etc.) in the calendar.
Origin of intercalate
1605-15; < Latin intercalātus past participle of intercalāre to insert a day or month into the calendar, equivalent to inter- inter- + calā- (stem of calāre to proclaim) + -tus past participle suffix
Related forms
intercalative, adjective
unintercalated, adjective
1. interject, introduce, insinuate. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for intercalate


verb (transitive)
to insert (one or more days) into the calendar
to interpolate or insert
Derived Forms
intercalation, noun
intercalative, adjective
Word Origin
C17: from Latin intercalāre to insert, proclaim that a day has been inserted, from inter- + calāre to proclaim
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for intercalate

"to insert a day into the calendar," 1610s, from Latin intercalatus, past participle of intercalare "to proclaim the insertion of an intercalary day," from inter- "between" (see inter-) + calare (see calendar). Related: Intercalated; intercalating.

Online Etymology Dictionary, © 2010 Douglas Harper
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