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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]].

[[Image:Freudpsyche.gif|thumb|300px|right|[[Unconscious|Freud's Model of the Unconscious]]]]

Although 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.

As a ''noun'', the ''noun-form'' designates one of the ''psychical systems'', refers to the [[unconscious|unconscious]] system, described by [[Freud]]'s, which [[Freud]] described in his, first theory of [[psyche|mental]] [[structure]] (the "[[topographical model]]"), first [[topography]] of the [[psyche]].

According to the [[Freud]]'s first "[[topographical model]]", the [[mind]] or [[psyche]]

is divided into three three separate component parts, systems or "psychical localities":

The [[unconscious|unconscious system]] is not merely that which is ''outside'' the field of [[consciousness]] at a given time, but that which has been radically [[separation|separated]] from [[consciousness]] by [[repression]] and thus cannot enter the [[conscious|conscious-preconscious system]] without [[distortion]].

In [[Freud]]'s second theory of [[mental]] [[structure]] (the "[[structural theory]]"), the [[mind]] is divided into the three "agencies" of [[ego]], [[superego]] and [[id]].