Halfpace
Pronunciation : Half"pace`
Part of Speech : n.
Definition : Defn: A platform of a staircase where the stair turns back in exactly the reverse direction of the lower flight. See Quarterpace.
Note: This term and quartepace are rare or unknown in the United States, platform or landing being used instead.
(Arch.)
Source : Webster's Unabridged Dictionary, 1913