An erroneous perception of reality
A false belief
Her comment on this delusion is instructive.
The witchcraft delusion of 1692 centred about Salem Village, now in the township of Danvers, but then a part of Salem.
the delusion that nature as represented in the classical pictures (bunjingwa) of China and Japan exists only in the artists imagination.
But you, too, shall be free from this delusion, this world of sense, this law of change.
You are under a delusion, said Prince Vasili, as he entered.