J. Laplanche and J-B Pontalis (1973) The Language of Psychoanalysis
An essential dictionary of terms and concepts, both historical and contemporary. Required.
Charles Rycroft (1995) A Critical Dictionary of Psychoanalysis - 2nd Ed.
This is not just a dictionary - it is a critical dictionary of psychoanalysis. As noted in the excellent Introduction, Dr. Rycroft gives an account of the origins, '...of their connection with other terms and concepts"...and '...of the controversies relating to them that exist among analysts themselves.'