not made of physical matter, or not important and not relevant to what's being discussed.
From 'im-' (not) + 'material' (from Latin 'materialis', meaning 'physical'). The philosophical sense referring to non-physical things dates back to medieval and Renaissance philosophy.
Philosophers have argued for centuries about immaterial things like consciousness, emotions, and ideas—but neuroscience is now showing that even these 'immaterial' experiences have very material explanations happening in your brain's physical neurons.
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