[count] American football :a score that is made by carrying the ball over the opponent's goal line or by catching the ball while standing in the end zone

A touchdown is worth six points and is usually followed by a kick that is worth another point.

[count] rugby :the act of scoring points by putting the ball on the ground behind an opponent's goal line

[count, noncount] :the moment when an airplane or spacecraft touches the ground at the end of a flight