Galilee porch. Theoretically, a western porch of a church. So-called, because it was supposedly the final station in the medieval Corpus Christi procession, where Christ leads his disciples after the resurrection into Galilee. In practice, this is all conjecture, and a fanciful Victorianism. Probably, the theory came from the porch built against the western front of some cathedrals, including one near to Suffolk at Peterborough.
A medieval Galilee porch, if such a thing existed outside of Cathedrals, can be found at Mutford, and a modern, glass-walled galilee forms the west porch at Ipswich St Mary. The so-called Galilees at Lakenheath and Debenham are not so; that at Lakenheath was a post-Reformation school building, while the one at Debenham is merely the main entrance to the building. A large structure once existed against the western face of the tower at Cavenham, but nobody really knows what it was.
It has come to mean any porch, or indeed any room, with a full view of the interior of the church. In the 1990s, a Galilee room, with a full view of the high altar, was built to accomodate families with young children at Kesgrave Holy Family and St Michael.