asˌsumed ˈname BrE AmE noun [countable]
if you do something under an assumed name, you do it using a name that is not your real name SYN pseudonym :
He’s been living in Peru under an assumed name.
ASSUMED NAME
Meaning of ASSUMED NAME in English
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012