li·tre (l??t?r)n. Chiefly British Variant of liter.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.litre (?li?t?) or litern1. (Units) one cubic decimetre2. (Units) (formerly) the volume occupied by 1 kilogram of pure water at 4°C and 760 millimetres of mercury. This is equivalent to 1.000028 cubic decimetres or about 1.76 pints[C19: from French, from Medieval Latin litra, from Greek: a unit of weight]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014li?ter (?li t?r) n. a unit of liquid capacity equal to the volume of one kilogram of distilled water at 4°C and equivalent to 1.0567 U.S. liquid quarts. Abbr.: l [1800?10;