تساوي الفاصلتين في الوزن دون التقفية
The equality of two ending words in pattern, without equality in final rhyme.
This is the basic definition of muwāzanah. Its beauty comes from balanced patterning, while it does not require the final-letter match central to sajʿ.
Longer passages may contain several balanced expressions, but the basic test looks at the patterns of the relevant ending words. Equal patterns with different terminal letters provide the clearest case.