Pronunciation: (dis"kon-tn-OO'i-tē, -yOO'-),[key] —n., —pl.-ties. 1. lack of continuity; irregularity: The plot of the book was marred by discontinuity. 2. a break or gap: The surface of the moon is characterized by major discontinuities. 3. Math.a point at which a function is not continuous.
4. Geol.a zone deep within the earth where the velocity of earthquake waves changes radically.