radioactivity [radioactivities]◼◼◼(emission of ionizing radiation) noun [UK: ˌreɪ.dɪəʊæk.ˈtɪ.vɪ.ti] [US: ˌreɪ.dɪo.ʊæk.ˈtɪ.vɪ.ti]'Radioactivity' is a chemistry term. = Radioactivité est un terme de la chimie.
radioactivity [radioactivities]◼◼◼(radiation emitted) noun [UK: ˌreɪ.dɪəʊæk.ˈtɪ.vɪ.ti] [US: ˌreɪ.dɪo.ʊæk.ˈtɪ.vɪ.ti]'Radioactivity' is a chemistry term. = Radioactivité est un terme de la chimie.