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noun \ˈin-ˌbäks\

Simple Definition of in–box

  • : a box or other container on a desk in which letters, notes, etc., that are sent to the desk are placed

  • computers : a computer folder that holds new e-mail messages

Source: Merriam-Webster's Learner's Dictionary

Full Definition of in–box

  1. :  a box or tray (as on a desk) for holding incoming interoffice mail; also :  a computer folder devoted to incoming e-mail

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