Something is
concrete if it is not
abstract: it is both
particular and an
individual, and (hence?) occupies some space and time. To say that a physical object is concrete is to say, approximately, that it is a particular individual that is located at a particular place and time.
See particular; individual; abstract.
In construction
? Concrete is a building material made from sand
? or other small stones,
water, and
cement. After mixing the cement hydrates and eventually dries out into a stone. Concrete was invented in the
Roman Empire, but the knowledge of its making was lost, to be reinvented only in modern times.
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