What one desires of a dictionary of an author's work is that it should give as many different definitions of a particular term as possible, using quotations from the author so that one can see the development of the particular thought over time. This is especially important with an author such as Bion whose writings reflect the changing nature of his ideas throughout his life. Because many of his published works are written in a somewhat cryptic fashion, they are open to idiosyncratic interpretation. To use his own term, imaginative conjectures are rife in interpreting Bion's meaning