अव्ययीभवः

This is also an adhikara aphorism like the last. As far as sūtra 21, the compounds treated of, will get the designation of Avyayibhava. The word अव्ययीभाव like the word कर्मप्रवचनीय is a self-descriptive term, and not an arbitrary term like डि,धि &c. When that which was not an indeclinable becomes an indeclinable, it is called stain or 'becoming an indeclinable'. In the Avyayibhava compound the sense of the first of its elements is the main one or the independent one on which the other depends.,