The degree to which a media container, such as an analog book (a paperback, a hardcover, etc.), an ebook, a website, or any other object holding media communicates its contents. High level mediality expresses itself in an abundance of different types of media contained by the product. Low level mediality suggests a scarcity of different media within the product.
An ebook has a higher level of mediality than a paperback book since an ebook can contain simple text (just like the paperback book) but also hyperlinks, video, sound, and other interactive features.