diffusion

(physics) the process of diffusing; the intermingling of molecules in gases and liquids as a result of random thermal agitation

आंत्र-सम्मिलन में फैलाव मूलभूत प्रतिरोध तथा ऊर्ध्वाधर विकर्षण कमजोर होता है

There has been diffusion of tension along the border in the past few months.