Synonyms for Solitary Wave (same or very similar meaning)
WordNet sense 1 ((physics) a quantum of energy or quasiparticle that can be propagated as a traveling wave in nonlinear systems and is neither preceded nor followed by another such disturbance; does not obey the superposition principle and does not dissipate):
soliton, soliton waveFrom the ODE community, based on WordNetadd/edit