The Collaborative International Dictionary of English v.0.48:

Liter \Li"ter\, Litre \Li"tre\ (l[=e]"t[~e]r; 277), n. [F.
   litre, Gr. li`tra a silver coin.]
   A measure of capacity in the metric system, being a cubic
   decimeter, equal to 61.022 cubic inches, or 2.113 American
   pints, or 1.76 English pints.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Litre \Li"tre\ (l[=e]"t[~e]r; 277), n. [F.]
   Same as Liter. [Chiefly Brit.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

litre
    n 1: a metric unit of capacity, formerly defined as the volume
         of one kilogram of pure water under standard conditions;
         now equal to 1,000 cubic centimeters (or approximately 1.75
         pints) [syn: liter, litre, l, cubic decimeter,
         cubic decimetre]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

LITRE. A French measure of capacity. It is of the size of a decimetre, or
one-tenth part of a cubic metre. It is equal to 61.028 cubic inches. Vide
Measure.