Despite religious diversity and sectarian precedents, Iranian society during the Timurid era experienced a distinctive pattern of interfaith relations characterized as “approximative living” (zist-e taghribi). This study investigates how these cross-sectarian interactions transitioned into sustainable mechanisms of social cohesion, addressing the central question: Through what structural mechanisms did approximative living reproduce and reinforce social solidarity in Timurid society? Adopting a descriptive-analytical method within a historical sociology approach, this study draws on primary historical sources alongside theories of social solidarity and social capital.The findings indicate that approximative living functioned on two structural levels: At the cultural-normative level, it reproduced the collective consciousness and redefined sectarian boundaries through the formation of shared horizons of meaning (centered on devotion to the Ahl al-Bayt), ritual co-presence, and trans-sectarian values. At the social-structural level, it accumulated “religious social capital” by expanding interactive networks, converting micro-level trust into institutionalized trust, and activating intermediary institutions such as Sufi lodges (khanqahs), craft guilds, and preaching assemblies. The results demonstrate that approximative living acted as a structural buffer, curbing latent conflicts and establishing dynamic, sustainable social equilibrium, ultimately serving as an intermediary foundation for subsequent macro-identity transformations in Iranian history.