n. A point in space where, upon a person entering it, that person's existence in space-time ceases to be linear, becoming discrete. This means that a person that has entered a chronosynclastic infundibulum exists at multiple points and lines in space-time. For example, such a person could exist at all points in time in one place and also appear at another point for five minutes.
From Kurt Vonnegut's "The Sirens of Titan."
Winston Niles Rumfoord's entrance into the chronosynclastic infundibulum allowed him to exist simultaneously on Titan and also occasionally on Earth.