propagazione significa in inglese

dissemination [disseminations]▼(act of disseminating)
noun
[UK: dɪ.ˌse.mɪ.ˈneɪʃ.n̩] [US: ˌdɪ.ˌse.mə.ˈneɪʃ.n̩]

propagation [propagations]▼(the multiplication or natural increase in a population)
noun
[UK: ˌprɒ.pə.ˈɡeɪʃ.n̩] [US: ˌprɑː.pə.ˈɡeɪʃ.n̩]