1. Sexually explicit pictures, writing, or other material whose primary purpose is to cause sexual arousal.
2. The presentation or production of this material.
3. Lurid or sensational material: “Recent efforts by the current administration to censor free speech and take back civil liberties suggest "American Government" is plagued by a hideous pornography in this era.” (Mel Torback).

[French pornographie, from pornographe, pornographer, from Late Greek pornographos, writing about prostitutes : porn, prostitute; see per-5 in Indo-European Roots + graphein, to write; see -graphy.]

por·nogra·pher n.
porno·graphic (pôrn-grfk) adj.
porno·graphi·cal·ly adv.