Glossary

medium
noun
general

A means of effecting or conveying something: such as

(a) plural usually: media

(1) a channel or system of communication, information, or entertainment 

  • compare mass medium

(2) a publication or broadcast that carries advertising

(3) a mode of artistic expression or communication

  • as his literary mediumhe has chosen a biographical form—Ernest Newman

(4) something (such as a magnetic disk) on which information may be stored

(b) media (plural) digital audio or video files available for playback or streaming

  • … the free video broadcasts can be downloaded to portable mediaplayers from a number of popular pod[cast] and vodcast Web sites. - Steve Miller
  • Apple's current keyboards can use the function keys … for alternate functions such as controlling volume, screen brightness, mediaplayback …- Dan Frakes

(c) material or technical means of artistic expression (such as paint and canvas, sculptural stone, or literary or musical form)”

Definition Source:  https://www.merriam-webster.com/dictionary/medium