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The Latin phrase ad interim (abbr. ad int., literally "in the time between") means "in the meantime" or "temporarily".
A diplomatic officer who acts in place of an ambassador is called chargé d'affaires ad interim.
Video Ad interim
Examples
Examples from classic literature:
The abbreviation a.i. is used in job titles. E.g. Director of Operations, a.i.
Maps Ad interim
References
Source of the article : Wikipedia