tandem

[tan-duhm]
adverb
1.
one following or behind the other: to drive horses tandem.
adjective
2.
having animals, seats, parts, etc., arranged tandem or one behind another.
noun
3.
a vehicle, as a truck, tractor, or trailer, in which a pair or pairs of axles are arranged in tandem.
5.
tandem trailer ( def 1 ).
6.
a team of horses harnessed one behind the other.
7.
a two-wheeled carriage with a high driver's seat, drawn by two or more horses so harnessed.
8.
any of various mechanisms having a tandem arrangement.
Idioms
9.
in tandem,
a.
in single file: They swam in tandem.
b.
in association or partnership.

Origin:
1735–45; special use (orig. facetious) of Latin tandem at length, finally, equivalent to tam so far + -dem demonstrative suffix

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tandem (ˈtændəm)
 
n
1.  a bicycle with two sets of pedals and two saddles, arranged one behind the other for two riders
2.  a two-wheeled carriage drawn by two horses harnessed one behind the other
3.  a team of two horses so harnessed
4.  any arrangement of two things in which one is placed behind the other
5.  in tandem together or in conjunction
 
adj
6.  (Brit) used as, used in, or routed through an intermediate automatic telephone exchange: a tandem exchange
 
adv
7.  one behind the other: to ride tandem
 
[C18: whimsical use of Latin tandem at length, to indicate a vehicle of elongated appearance]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

tandem
1785, "carriage pulled by horses harnessed one behind the other," punning use of L. tandem "at length (of time)," from tam "so" + demonstrative suffix -dem. Transferred by 1884 to bicycles with two seats.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Hybrids are able to run by alternating their use of gasoline and electric power
  or by using the two in tandem.
Both superpowers pursued their space program in tandem with missile research
  and development.
By day, paddle slaloms in tandem kayaks around frisky seals and lobster buoys
  while ospreys and gulls soar overhead.
First-timers can get in on the fun by sailing in tandem with a licensed
  instructor.
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