|Eustatic sea-level change|
A change in the Global Mean Sea Level caused by changes in the volume of the world's oceans. This could be due either to thermal expansion or to an increase in the total amount of water.
1. Click here to read Carl Wunsch's paper Decadal Trends in Sea Level Patterns: 1993-2004. The key quote is:
"It remains possible that the data base is insufficient to compute mean sea level trends with the accuracy necessary to discuss the impact of global warming–as disappointing as this conclusion may be. The priority has to be to make such calculations possible in the future."
I.E., if you hear someone say the sea-level rise is accelerating, they can't know this because the existing data are insufficient to make this conclusion.