This study sheds light on a key concept of Yogācāra intersubjectivity that played a significant role in medieval Chinese Yogācāra. Specifically, it analyzes how Kuiji 窺基 (632–682) reinterprets adhipati (activating and amplifying influence; Ch: zengshang 增上 or zengshang li 增上力 or zengshang yuan 增上緣) to account for intersubjective karmic interactions across different lifeworlds in the events of teaching and killing.As this line of investigation shows, Kuiji’s theory of adhipati attempts to sidestep the entanglement of the problems of intersubjectivity and incommensurable (...) worlds in Yogācāra. Extant scholarship on intersubjectivity often presumes one spatio-temporal world populated by sentient beings and insentient objects, which is fundamentally at odds with the Yogācāra tenet that each mental stream generates its distinct lifeworld. To address the pragmatic question of how different mental continuums of consciousnesses can impinge into each other’s lifeworlds, Kuiji employed adhipati in a specific way to account for intersubjective interplay across different, potentially incommensurable worlds. In this framing of intersubjectivity, the problem of one world or many worlds is explained non-dualistically: these lifeworlds are neither the same nor different, neither one nor many, but karmically interconnected.Expanding on recent discussions of the puzzle of intersubjectivity in Yogācāra, this paper shows that Kuiji’s deployment of adhipati provides an account of genuine intersubjectivity in which different mental continuums are recognized as subjects and engage in causal interactions among different spatio-temporal worlds. In Kuiji’s framing, this genuine intersubjectivity gives rise to the sense of one shared world. (shrink)