mediumn.[L. medium the middle, fr. medius middle. See Mid, and cf. Medius.]1. That which lies in the middle, or between other things; intervening body or quantity.()The just medium . . . lies between pride and abjection. (L'Estrange.) (Math.) See Mean.()2. 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. (Bacon.)I must bring together
All these extremes; and must remove all mediums. (Denham.)3. An average.()A medium of six years of war, and six years of peace. (Burke.)4. A trade name for printing and writing paper of certain sizes. See Paper.()5. (Paint.) The liquid vehicle with which dry colors are ground and prepared for application.()6. (Microbiology) 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.()7. 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}.()Circulating medium, a current medium of exchange, whether coin, bank notes, or government notes. -- Ethereal medium (Physics), the ether. -- Medium of exchange, that which is used for effecting an exchange of commodities -- money or current representatives of money.()a. Having a middle position or degree; mean; intermediate; medial; as, a horse of medium size; a decoction of medium strength.()