This term simply expresses the fact that the outward situation releases a psychic process in which certain contents gather together and prepare for action. When we say that a person is “constellated” we mean that he has taken up a position from which he can be expected to react in a quite definite way.
Jung provides the canonical depth-psychological definition of constellation as the automatic, involuntary gathering of psychic contents in response to an external situation, determining the subject’s subsequent reaction.
, The Structure and Dynamics of the Psyche, 1960thesis