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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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Last edited October 2, 2001 11:50 pm by Mike dill (diff)