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cathexis (n.)

"concentration or accumulation of mental energy," 1922, from Latinized form of Greek kathexis "holding, retention," from PIE root *segh- "to hold." Used by psychologists to render Freud's (Libido)besetzung.

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Definitions of cathexis

cathexis (n.)
(psychoanalysis) the libidinal energy invested in some idea or person or object;
Freud thought of cathexis as a psychic analog of an electrical charge
Synonyms: charge
From wordnet.princeton.edu