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1327 datum [n]

constr. geo. surv. (1. Fixed or assumed point, line or surface in relation to which others are determined. 2. A level surface, such as fixed ground level or mean sea level, used as a reference from which elevations are computed; ►benchmark, ►datum point. 3. The d. of a given site is a site datum); syn. datum level [n], datum plane [n]; s cota [f] de referencia (Nivel de altura fijado en obra al cual se refieren todas las demás alturas; ►marca geodésica, ►punto