Experimental evidence for one-dimensional domain-wall relaxation above ${T}_{c}$ in the quasi one-dimensional ferromagnet [(C${\mathrm{H}}_{3}$)$_{4}\mathrm{N}$] Ni${\mathrm{Cl}}_{3}$ has been obtained from ac susceptibility measurements in the frequency range $10 \mathrm{Hz}<\ensuremath{\nu}<30 \mathrm{MHz}$. The field and temperature dependence of the absorption is well explained by the interaction of $\ensuremath{\pi}$ solitons with the oscillating magnetic field.