Hypertext Webster Gateway: "Touchdown"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Touchdown \Touch"down`\, n. (Football)
The act of touching the football down behind the opponents'
goal .
{Safety touchdown}. See under {Safety}.
From WordNet (r) 1.7 (wn)
touchdown
n 1: a score in American football; being in possession of the
ball across the opponents' goal line
2: a landing (as the wheels touch the landing field);
especially of airplanes
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