Serial in US/English is mostly a technical term. Serial line, serial data transmission (in telecommunication and computer/network technology). In sex relationship - serial monogamy. Also serial killer
I never heard it as synonym of "TV series"
Mini-series is analog of Soviet/Russian "serials" (story with fixed plot - like "17 movements of spring" or "Meeting place cannot be changed" )
Soap opera is something which has no pre-defined plot flow , and has no ending
Социальные закладки