expansion [expansions](act of expanding) noun [UK: ɪk.ˈspæn.ʃn̩] [US: ɪk.ˈspæn.ʃn̩]Esperanto is a huge expansion of my horizon. = L'esperanto è una enorme espansione del mio orizzonte.
in espansionenoun
burgeoning(growth or expansion) noun [UK: ˈbɜː.dʒən.ɪŋ] [US: ˈbɝː.dʒən.ɪŋ]