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While the notion of a [[unconscious|non-conscious]] part of the [[mind]] or [[psyche]] has a long history in both [[philosophy]] and the [[psychology|psychological]] [[science|sciences]], [[Sigmund Freud]] is often credited with the discovery of the "[[unconscious]]".

Although the The term "[[unconscious]]" had been used by writers prior to [[Freud]], it acquires a completely original meaning in his work, in which it constitutes the single most important concept.