Definitions
1.NounA container in which papers to be dealt with are put.
2.NounAn electronic folder serving the same purpose, but for electronic files, especially email.
3.NounThe aggregate of items that demand one's attention or effort."The kids, my ex, my parents, the job, bills — my inbox is full."
4.VerbTo put (something) in someone's inbox."I just inboxed you the presentation."
5.VerbTo communicate with (a person) by writing to their electronic inbox.