This spell will magically lock a door, preventing it from being opened for a presumably limited amount of time. It is easily countered by Alohomora, however. The word is a combination of "colligare" (Latin for "bind together") and "porta" (Latin for "door"). Used in Harry Potter and the Order of the Phoenix when Hermione needs to seal a door in the Department of Mysteries against some Death Eaters. The fact that the Death Eaters didn't just open the doors with Alohomora may indicate complications.
