ˈhælsiːən ˈhælsiːən ˈpɹɑs.pə.ɹəs ˈpɹɒs.p(ə.)ɹəs marked by peace and prosperity a golden era the halcyon days of the clipper trade idyllically calm and peaceful; suggesting happy tranquillity a halcyon atmosphere a mythical bird said to breed at the time of the winter solstice in a nest floating on the sea and to have the power of calming the winds and waves