俱舍論記 5.6

5.6

「本論說此名眾同分」者，此即第二會異名。多體類等名為眾同，分是別義。又解：眾多法相似因，名眾同分。又解：眾多有情展轉同因，名眾同分。

"The fundamental treatise (mūla-śāstra) calls this generic commonality (nikāya-sabhāgatā)": this is the second part, harmonizing different names. Many substances being similar in kind is called 'generic sameness' (nikāya-sabhāga); 'portion' (bhāga) means distinction. Another explanation: the cause of similarity among many phenomena is called generic commonality. Another explanation: the cause of mutual sameness among many sentient beings is called generic commonality.