There are other words for this, solitude, contemplation. For me the best way to describe it is feeling god’s presence. I have read on the subject, not exhaustively but it seems conspicuous by its absence to me that it is never described this way by people like, Thomas a Kempis, Henri Nouwen, Richard Foster and others. From what they say when they write that is what is happening for them from what I can tell but never put in those terms. That was how it was described for me by someone way back in college and when I heard that it is possible to feel god’s presence I wanted to very much.
The scriptures are FULL though of talk about god’s presence. Moses saying that he and the people might as well just stay where they are in the desert unless god’s presence goes with them. That is how much it meant to Moses. When I hear the phrase knowing god or know the lord that is what it means to me. And it means legitimately a lot of other things to other people. I do think that some get away with intellectualizing the scriptures when a real experiential relationship with god is described, where the dynamics of relationships with other people is a much better way of describing, in my opinion, what they are talking about than knowing stuff about god or the bible. The evil one knows a lot about him, has seen him in his unveiled glory yet despises him, something I cannot imagine but I think that is true.
Anyway, that is the experience of silence from my point of view.