su ‧ prem ‧ a ‧ cy /sʊˈpreməsi, sjuː- $ sʊ-, suː-/ BrE AmE noun [uncountable]
the position in which you are more powerful or advanced than anyone else:
Japan’s unchallenged supremacy in the field of electronics
⇨ ↑ white supremacist
su ‧ prem ‧ a ‧ cy /sʊˈpreməsi, sjuː- $ sʊ-, suː-/ BrE AmE noun [uncountable]
the position in which you are more powerful or advanced than anyone else:
Japan’s unchallenged supremacy in the field of electronics
⇨ ↑ white supremacist
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012