discontinuity

Etymology

From Late Latin discontinuitās, from discontinuus.

noun

1. A lack of continuity, regularity or sequence; a break or gap.
   Shock waves are sudden discontinuities propagated in compressible media – usually air. 2012, George Dyson, Turing's Cathedral, Penguin, published 2013, page 57
2. (mathematics) A point in the range of a function at which it is undefined or discontinuous.
3. (geology) a subterranean interface at which seismic velocities change