dis·con·ti·nu·i·ty 
(dĭs-kŏn′tə-nĭ-tē, -ny-)
(dĭs-kŏn′tə-nĭ-tē, -ny-)n. pl. dis·con·ti·nu·i·ties
1. Lack of continuity, logical sequence, or cohesion.
2. A break or gap.
3. Geology A surface at which seismic wave velocities change.
4. Mathematics
a. A point at which a function is defined but is not continuous.
b. A point at which a function is undefined.