Touchdown

noun

1. A six-point score occurring when the ball enters possession of a team's player in the opponent's end zone.

   "Today I scored my first touchdown."

2. A defensive action of grounding the ball in the team’s own in-goal to stop the play
3. A try (scoring play of grounding the ball in the opposing team’s in-goal)
4. The moment when an aircraft or spacecraft makes first or final contact with the ground during a landing.

   "The passengers audibly relaxed at touchdown."

5. The moment of contact of a tornado with the ground.