"Being perceived immediately" means direct perception. "Being perceived mediately" refers to experiencing through the use of another medium or intervening component, which allows one to sense the results without also being aware of the original source.
Berkeley uses the example of reading a book to illustrate the difference between immediate and mediate perception. He says, "When I read a book, what I immediately perceive are the letters, but mediately, or by means of these, are suggested to my mind the notions of God, virtue, truth [or whatever the book is about]."
Berkeley emphasises that we don't immediately perceive the origins of sounds, colours, etc. For instance, we don't instantly hear the truck driving down the street what we first perceive is the noise right away. In this instance, the vehicle appears to me as mediate.
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