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merepinna tase, mis on arvutatud mingi pikema perioodi tunniandmete aritmeetilise keskmisena, aeroloogias kõigi kõrguste algnivoo, lennunduses algtase, millest kõrgemal mõõdetakse kõrgust baromeetrilise altimeetriga
the average height of the surface of the sea for all stages of the tide, level above which altitude is measured by a pressure altimeter
