"the middle quality between two extremes of size or another quality"
me•di•um
|ˈmēdēəm| noun (pl. media |-dēə| or mediums)
1. an agency or means by which something is communicated, expressed or performed; the intervening substance through which impressions are conveyed to the senses; the substance in which an organism lives or is cultured.
2. the material or form used by an artist, composer, performer, writer or other craftsperson.
3. a person claiming to be in contact with the spirits of the dead and to communicate between the dead and the living.
4. adjective: the middle quality or state between two extremes of size or another quality; a reasonable balance; halfway between rare and well-done.
5. the name of a fictitious family and a real theatre company encompassing all of the above ideas.
"an agency or means by which something is communicated"