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A metaphysical doctrine denying the existence of matter.

im′ma·te′ri·al·ist adj. & n.
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However, such contradictions were not confined to Wordsworth's desire to ensure the material durability of his immaterialist poetics.
The early period is dominated by Berkeley's immaterialist philosophy, by for which he is now best known, a philosophy that was developed around 1707, then published in 1709-13.
d'Onofrio 1994:119), which seemed certainly to flout the Neoplatonic immaterialist imagination about the cognitive apogee of humankind.
He points out that Berkeley, who is widely understood as the prototypical idealist, is in fact an immaterialist who never uses the term 'idealism' to designate his own position.
The paper makes a specific point: if one were to accept at face value the apparent, immaterialist reading of Aristotle's passages on the intellective soul, one can account for this interpretation as an outcome of Aristotle's naturalism--more precisely, as an outcome of a specific solution that is supposed to save Aristotle's naturalism.
The degree to which Leibniz was, if at all, an immaterialist ("idealist" in the terminology I'm here criticising) is subject to much contemporary dispute.
You know, esse est percipi--to be is to be perceived--as Bishop George Berkeley, the great eighteenth-century immaterialist, might have put it.
That enables the author to avoid the pitfalls both of a simplistic "basis-superstructure" model such as prevailed in crude Marxist historiography, and of the immaterialist claims of a radical postmodernism that treats extant documents as "texts" and not data to reconstruct material reality.
That is, what had allowed Berkeley to be 'idealistic' about the material world--his immaterialist reduction of that world to it to a realm of subjective ideas-was his corresponding realism about the mental-in particular, his realism about the subjective mind and its contents, and, beyond this, the mind of God.
It is as if, when designing it, he ceased being the immaterialist philosopher, and just followed the utopian way of thinking.
In an immaterialist philosophy such as Berkeley's, how do we measure the natural world?
Hazlitt's strong sense of the mind's ability to turn thought to substance unmistakably manifests the influence of an immaterialist philosophy.