[adjective], preposition, [noun] [C] [plural:] antis informalWe've received a lot of anti letters about (= letters opposing) that newspaper article.Just because I won't join you, it doesn't mean that I'm anti (= against) you.So what do you think about smoking in public places - are you (a) pro or (an) anti? (= do you support or oppose it)?
Meaning of ANTI in English
Cambridge English vocab. Кембриджский английский словарь. 2012