Tandem \Tan"dem\, n. A tandem bicycle or other vehicle.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Tandem \Tan"dem\, 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.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Tandem \Tan"dem\, n. A team of horses harnessed one before the other. ``He drove tandems.'' --Thackeray.

Tandem engine, a compound steam engine having two or more steam cylinders in the same axis, close to one another.

Tandem bicycle or tricycle, one for two persons in which one rider sits before the other.

Source: Webster's Revised Unabridged Dictionary (1913)