Medium /(?)/

pl. Media, E, Mediums

1. That which lies in the middle, or between other things; intervening body or quantity.

   The just medium . . . lies between pride and abjection.

2. See Mean. (Math.)
3. A substance through which an effect is transmitted from one thing to another; as, air is the common medium of sound.

   Whether any other liquors, being made mediums, cause a diversity of sound from water, it may be tried.

   I must bring together All these extremes; and must remove all mediums.

4. An average. [R.]

   A medium of six years of war, and six years of peace.

5. A trade name for printing and writing paper of certain sizes. See Paper.
6. The liquid vehicle with which dry colors are ground and prepared for application. (Paint.)
7. A source of nutrients in which a microorganism is placed to permit its growth, cause it to produce substances, or observe its activity under defined conditions; also called culture medium or growth medium. The medium is usually a solution of nutrients in water, or a similar solution solidified with gelatin or agar. (Microbiology)
8. A means of transmission of news, advertising, or other messages from an information source to the public, also called a news medium, such as a newspaper or radio; used mostly in the plural form, i. e. news media or media. See 1st media{2}.

1. Having a middle position or degree; mean; intermediate; medial; as, a horse of medium size; a decoction of medium strength.