Football. an act or instance of scoring six points by being in possession of the ball on or behind the opponent's goal line.
Rugby. the act of a player who touches the ball on or to the ground inside his own in-goal.
the act or the moment of landing: the aircraft's touchdown.

1860–65; touch + down1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
touchdown (ˈtʌtʃˌdaʊn)
1.  the moment at which a landing aircraft or spacecraft comes into contact with the landing surface
2.  rugby the act of placing or touching the ball on the ground behind the goal line, as in scoring a try
3.  American football See also field goal TD a scoring play worth six points, achieved by being in possession of the ball in the opposing team's end zone
4.  (of a space vehicle, aircraft, etc) to land
5.  rugby to place the ball behind the goal line, as when scoring a try
6.  informal to pause during a busy schedule in order to catch up, reorganize, or rest

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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Word Origin & History

1864, from touch (v.) + down (adv.). Originally in rugby, where the ball is lit. touched down on the other side of the goal.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
When she got there, she was agreeably surprised to discover a tidy store-a
  field goal, a touchdown.
Touchdown marked the point where plane and terminator finally coincided.
The so-called experimental aircraft made a successful touchdown, but that's
  when things evidently went wrong.
He kept the ball and ran all the way to the touchdown.
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