landing or broad step
• (n.) A platform of a staircase where the stair turns back in exactly the reverse direction of the lower flight. See Quarterpace.
Half'pace` (-pās`) noun (Architecture) A platform of a staircase where the stair turns back in exactly the reverse direction of the lower flight. See Quarterpace . » This term and quarterpace are rare or unknown in the United States, platform or landing ...
In architecture a halfpace is a platform of a staircase where the stair turns back in exactly the reverse direction of the lower flight.