for geodetic coordinates, is there a difference between a datum and an ellipsoid?

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Looking at the Wikipedia page for the North American Datum, it seems to imply that the datum is completely defined by the ellipsoid, which defines the major/semi-major axes, flattening, etc. For geodetic coordinates, are a datum and an ellipsoid definition the same thing? Can the terms be used interchangeably?

e.g. is NAD83 wholly and completely defined by the ellipsoid GRS80?



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