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.
1 An attribute that allows a speaker's words to become powerful. 2  Chiasmus. 3  From the name of the Greek letter  Ï , a figure of speech consisting of the contrasting of two structurally parallel syntactic phrases arranged cross-wise, i.e., in such a way that the second is in reverse order from the first.