Code coverage means, how well your test set is covering your source code. i.e. to what extent is the source code covered by the set of Test cases. As mentioned in above answers, there are various coverage criteria, like paths, conditions, functions, statements, etc.
Chiasmus. Definition: Chiasmus is a specific type of parallelism. It consists of two parallel phrases in which corresponding words or phrases are placed in the opposite order.
Example 7: the dreaded cross-relation. There are four types of motion by which one may progress from one interval to another: parallel, similar, oblique, and contrary. In parallel motion, both voices move in the same direction by the same melodic interval (example 8a). In similar motion, both voices simply move in the same direction (example 8b).