Mixed media (1950s?, fine art, 35M hits): Describes a work that mixes two or more visual media, often restricted to the disciplines of painting and sculpture.
2. (1990s, computer science): Describes a device that can display multiple types of media–sound, video, text, images, etc.
3. (1990s, popular): Describes a work in any medium either created or experienced using such a device; largely replaced in current usage by “new media.”
New media (1990s, media theory, 69M hits): Describes works which are both created and experienced using a computer.
Transmedia (1990s, media theory, 3M hits): Describes a narrative dispersed across multiple works in multiple media, each of which contains only a portion of the complete story. A long-running franchise like “Star Wars” can be considered one epic transmedia work. (Coined by Marsha Kinder.)
Rich media (2000s?, design, 9M hits): Describes works distributed via the internet that make use of sound and video, as opposed to images and text.
(Hit counts from search performed 23 mar 12.)