Here is a context clues on the verb envision. It is used only transitively and means–as the context clues in the sentences in this document point towards–“to picture to oneself.”
And that is pretty much it–other than, perhaps, a mild argument that this is a word students should know before they graduate high school.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.