adv. & a. [ L. tandem at length (of time only), punningly taken as meaning, lengthwise. ] One after another; -- said especially of horses harnessed and driven one before another, instead of abreast. [ 1913 Webster ]
n.
Tandem bicycle
Tandem tricycle
. A kind of two-wheeled vehicle with seats back to back, the front one somewhat elevated. [ Webster 1913 Suppl. ]
. A steam engine having two or more steam cylinders in line, with a common piston rod. [ Webster 1913 Suppl. ]
. (Elec.) same as Cascade system. [ Webster 1913 Suppl. ]