• differential parameter of the 1st order

प्रथम:    primate pro prim primus quick opening aboriginal

प्रथम कोटि:    first grade first order

प्रथम कोटि का:    number one

कोटि:    category ordinate order rate grade degree rank

का:    presumably belonging to of by squander encode

अवकल:    differential

अवकल प्राचल:    differential parameter

प्राचल:    parameter parametric quantity