
1) Insert in a calendar 2) Interpose 3) To interpolate
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https://www.crosswordclues.com/clue/intercalate

• (v. t.) To insert among others, as a verse in a stanza; specif. (Geol.), to introduce as a bed or stratum, between the layers of a regular series of rocks. • (v. t.) To insert, as a day or other portion of time, in a calendar.
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http://thinkexist.com/dictionary/meaning/intercalate/

1. To insert, as a day or other portion of time, in a calendar. ... 2. To insert among others, as a verse in a stanza; specif. ... <geology> To introduce as a bed or stratum, between the layers of a regular series of rocks. 'Beds of fresh water shells . . . Are intercalated and interstratified with the shale.' (Mantell) ... Origin: L. Interca...
Found on
http://www.encyclo.co.uk/local/20973

In·ter'ca·late transitive verb [ imperfect & past participle Intercalated ; present participle & verbal noun Intercalating .] [ Latin intercalatus , past participle of intercalare to intercalate to intercalate; inter
Found on
http://www.encyclo.co.uk/webster/I/76

[
v] - insert (days) in a calendar
Found on
http://www.webdictionary.co.uk/definition.php?query=intercalate
verb insert (days) in a calendar
Found on
https://www.encyclo.co.uk/local/20974

to interpolate; interpose. · to insert (an extra day, month, etc.) in the calendar.
Found on
https://www.infoplease.com/dictionary/intercalate
No exact match found.