IPA: /ˌæntiˈpɔrnəˌɡrɑfi/
KK: /æntiˌpɔrnəˈɡrɑfi/
Opposed to the distribution and use of sexually explicit material.
The organization promotes antipornography policies to protect children from harmful content.
Antipornography is formed from "anti-" (meaning against) and "pornography" (from Greek "pornographia", where "porne" means prostitute and "grapho" means to write). The term refers to being against the depiction or writing about sexual acts or pornography.
Think of 'anti-' meaning against, and 'pornography' relating to writing about sexual content. This helps you remember that antipornography means being against such depictions.