Meaning

noun a means or instrumentality for storing or communicating information

noun the surrounding environment

noun an intervening substance through which signals can travel as a means for communication

originBorrowed from Latin medium, neuter of medius (“middle”), from Proto-Italic *meðjos, from Proto-Indo-European *médʰyos (“between”). Compare middle. Doublet of mid, medio, media, and meson.

Etymology from Wiktionary, CC BY-SA 3.0