Dictionary.net

• a metric unit of capacity equal to the volume of 1 kilogram of pure water at 4 degrees centigrade and 760 mm of mercury (or approximately 1.76 pints)

2006 - WordNet 3.0
By Princeton University

• a metric unit of capacity equal to the volume of 1 kilogram of pure water at 4 degrees centigrade and 760 mm of mercury (or approximately 1.76 pints)

2011 - English Dictionary Database
By DataStellar Co., Ltd