an·ti-

/ˌænˌtaı, ˌænti; sometimes ˌæntı before consonants/ prefix

1 : opposite to something

anticlimax

antisocial

2 : against someone or something

antigovernment [=opposed to the government]

antismoking

antiwar

— often used with a hyphen

anti-American

anti-poverty

anti-gun

opposite ↑pro-

3 : acting to prevent something

antibacterial

antifreeze

antitheft

4 : fighting or defending against something

antiaircraft