'''Substance''' is that of which a thing consists; physical [[matter]] or material: form and substance. a species of matter of definite [[chemical]] composition, such as: ''a chalky substance''.
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'''Substance''' is that of which a thing consists; physical [[matter]] or material: form and substance. a species of matter of definite [[chemical]] composition, such as: ''a chalky substance''.
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In [[philosophy]], "sub-stance" is the essence, the unseen reality that "stands under" or is the foundation of that of which a thing outwardly consists, the real under-lying essence of actual being which is expressed by the changeable "accidents" or visible manifestations or quality of the thing or even persons.