sõplét ; suplét ; supleut, suplet•

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Œd ‹sõ•› za ‘com•’ ta ‹plét› za ‘plex’, œd ‹plesti› ‘(lat.) plecto’.
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In psychology, a complex is a "complex" (meaning tangled or complicated) network of emotionally charged ideas, memories, and impulses centered around a specific theme in the unconscious, such as an inferiority complex. Coined primarily by Carl Jung, it represents a "knot" of feelings that, when triggered, bypasses conscious control and dictates behavior.

Key reasons for the term:

It is a "Group" of Associated Feelings: Jung discovered through word-association tests that related ideas, memories, and emotions cluster together around a central "nucleus" (e.g., a traumatic event or recurring conflict).
The Emotional Charge (Affect): These clusters are not just ideas; they are "affectively toned," meaning they carry intense emotions (fear, anger, love) that can "take over" the personality, explains frithluton.com.
"Complicated" Inner Structure: These complexes are often contradictory to a person's conscious, rational personality, leading to puzzling behaviors or "split-off" parts of the mind.

Origins of the Term:
Carl Jung called them "feeling-toned complexes of ideas" to describe the knots in the subconscious that drive emotional reactions. If a person has a "mother complex," it means a tightly linked, emotionally charged group of thoughts, experiences, and impulses regarding their mother is dominating their reactions.

(Google)