transición
/tɾansiˈθjon/ · B2 · noun · f
passage
🔄 trans- (across) + ición (-ition, going) = a going across from one state to another
Latin transitio comes from trans (across) + ire (to go). So transición is literally a going across, the move from one state or stage to the next. English transition is the same word, with the same -tion ending as Spanish -ción.