medium

1. (plural media or mediums) The chemistry of the surrounding environment, e.g. solid, liquid, gas, vacuum, or a specific substance such as a solvent.
2. (plural media or mediums) The materials or empty space through which signals, waves or forces pass.
3. (plural media or mediums) A format for communicating or presenting information.
4. (plural media or mediums) The materials used to finish a workpiece using a mass finishing or abrasive blasting process.
5. (plural media or mediums) A nutrient solution for the growth of cells in vitro.
6. (plural media or mediums) The means, channel, or agency by which an aim is achieved.
7. (plural mediums or media) A liquid base which carries pigment in paint.
8. (plural mediums or media) A tool used for painting or drawing.

   Acrylics, oils, charcoal, and gouache are all mediums I used in my painting.

9. (plural mediums) Someone who supposedly conveys information from the spirit world.
10. (plural mediums) Anything having a measurement intermediate between extremes, such as a garment or container.
11. (plural mediums) A person whom garments or apparel of intermediate size fit.
12. (plural mediums) A half-pint serving of Guinness (or other stout in some regions).
13. A middle place or degree.

    a happy medium

14. An average; sometimes the mathematical mean.
15. The mean or middle term of a syllogism, that by which the extremes are brought into connection.

1. Arithmetically average.
2. Of intermediate size, degree, amount etc.
3. Of meat, cooked to a point greater than rare but less than well done; typically, so the meat is still red in the centre.

adverb

To a medium extent