sem·el·pa·rous \(ˈ)sem¦elpərəs\adjective Etymology: Latin semel once (akin to Latin simul together, at the same time) + English -parous — more at same : reproducing or breeding only once in a lifetime < semelparous salmon > < a semelparous agave > • sem·el·par·i·ty\¦seməl¦parəd.ē \noun