Tandem

[2] It is a word play, using the Latin phrase (referring to time, not position) for English "at length, lengthwise".

Any straps running across the back of the leader should be sewn or use special buckles which don't leave a loose tab that might catch a rein in it.

[5]: 63 A tandem cart is constructed in the style of a dogcart and used mainly for show, and should be tall enough for the driver to look over the head of the lead horse.

Legally defined by the distance between the axles (up to 2.5 m (8 ft 2+3⁄8 in) in the European Union, 40–96 inches (1.02–2.44 m) in the United States), mechanically there are many configurations.

Attack aircraft and all-weather interceptors often use a second crew member to operate avionics such as radar, or as a second pilot.

A common engineering adaptation is to lengthen the cockpit or fuselage to create a trainer with tandem seating from a single-seater aircraft.

The tandem configuration has the advantage of being closer to the normal working environment that a fast jet pilot is likely to encounter.

Also, a single seat cockpit can be redesigned into a side-by-side arrangement in the case of the Douglas A-1 Skyraider, TF-102 trainer or the Hawker Hunter training versions.

During mating among odonata (dragonflies and damselflies), a male uses claspers at the end of his abdomen to grab a female between the head and thorax, forming a tandem.