WordWeb Online

1. An arrangement of two or more objects or persons one behind another
    
2. A bicycle with two sets of pedals and two seats
   - bicycle-built-for-two, tandem bicycle

1. One behind the other
   "ride tandem on a bicycle built for two"; "riding horses down the path in tandem";
   - in tandem

Derived forms: tandems

Type of: arrangement, bicycle, bike, cycle, placement

Encyclopedia: Tandem