IPA: /ˌɪn.təˈkleɪt/
KK: /ɪnˈtɜr.kə.leɪt/
To insert something, such as a day or month, into a sequence or schedule, especially in a calendar.
The school decided to intercalate an extra holiday in the calendar this year.
Past: intercalated
Past Participle: intercalated
Intercalate → It is formed from "inter-" (meaning between) and "calare" (meaning to call). The word describes the act of inserting something between other things, such as days or months in a calendar.
Think of inserting something 'between' ('inter-') two things that are 'called' ('calare') — that's why intercalate means to insert something in between.