† reniˈtationObs.rare—1. [irreg.f. L. renītī(see next) + -ation.] = renitency 1. 1597A. M. tr.Guillemeau's Fr. Chirurg. 21 b/1 If there be greate quantitye it causeth such a renitatione or stretchinge out, as a bottle which is full, and closelye stopped.