(1):
(n.) A cross, set upon three steps; - more properly called cross calvary.
(2):
(n.) A representation of the crucifixion, consisting of three crosses with the figures of Christ and the thieves, often as large as life, and sometimes surrounded by figures of other personages who were present at the crucifixion.
(3):
(n.) The place where Christ was crucified, on a small hill outside of Jerusalem.