- The substance or entity through which something is transmitted, conveyed, carried, or the like. For example, a vacuum, a fluid, a plasma, or a solid.
- A surrounding environment within which materials and entities exist, and within which phenomena, such as that of a physical or chemical nature, take place. For example, a vacuum, a fluid, a plasma, or a solid.
- Any physical material or medium which serves to store or otherwise contain data. For instance, optical disks, magnetic tapes and disks, microfilm, and paper. Also called data medium, or storage medium.
- Situated or occurring between two values or degrees. For instance, occurring at or near the middle of an interval.
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