touchdown /ˈtʌt͡ʃ.daʊn/ noun5 •The moment when an aircraft or spacecraft makes first or final contact with the ground during a landing.The passengers audibly relaxed at touchdown. •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. •A try (scoring play of grounding the ball in the opposing team's in-goal).A first Test try by Fergus McFadden and a Tomas O'Leary touchdown helped Ireland to a 15-12 half-time lead. — 2011 •The moment of contact of a tornado with the ground.The American Red Cross sent me to Alabama within twenty-four hours of the tornado's touchdown, and I visited the communities of Oak Grove and Rock Creek four subsequent times. — 2003 •A defensive action of grounding the ball in the team's own in-goal to stop the play. formstouchdowns