tonne(n = noun.quantity) metric ton, mt, t - a unit of weight equivalent to 1000 kilograms;
is a kind of metric weight unit, weight unit
has parts: quintal

   A tun. Chaucer. [1913 Webster]

   A metric ton. [Webster 1913 Suppl.]

tonne, n. a metric ton equal to 1,000 kg.

Etymology:
F: see TUN