The Collaborative International Dictionary of English v.0.48:

Pornography \Por*nog"ra*phy\, n. [Gr. ? a harlot + -graphy.]
   1. Licentious painting or literature; especially, the
      painting anciently employed to decorate the walls of rooms
      devoted to bacchanalian orgies.
      [1913 Webster]

   2. (Med.) A treatise on prostitutes, or prostitution.
      [1913 Webster]

   3. obscene pictures, writings, drawings, motion pictures,
      videos, or the like intended primarily to cause sexual
      arousal and having little or no artistic merit; also, the
      content of such materials.
      [PJC]

WordNet (r) 3.0 (2006):

pornography
    n 1: creative activity (writing or pictures or films etc.) of no
         literary or artistic value other than to stimulate sexual
         desire [syn: pornography, porno, porn, erotica,
         smut]

Moby Thesaurus II by Grady Ward, 1.0:

60 Moby Thesaurus words for "pornography":
   French literature, Rabelaisianism, Renaissance literature,
   X-rated movie, ancient literature, bawdiness, bawdry,
   belles lettres, blue movie, classics, contemporary literature,
   dirt, dirtiness, dirty movie, erotic art, erotic literature,
   erotica, erotographomania, fescenninity, filth, filthiness,
   folk literature, foulness, humane letters, iconolagny, kitsch,
   letters, lewdness, literature, medieval literature, nastiness,
   national literature, obscene literature, obscenity, offensiveness,
   polite literature, pop literature, popular literature, porn,
   pornographic art, pornographic literature, pornographomania,
   pseudonymous literature, republic of letters, ribaldry,
   salaciousness, salacity, scatological literature, scurrility,
   serious literature, sexploitation, skin flick, smut, smuttiness,
   soft-core pornography, stag film, travel literature,
   underground literature, vileness, wisdom literature



The Free On-line Dictionary of Computing (30 December 2018):

pornography
erotica
porn
porno

    Still and moving images, usually of women, in
   varying states of nudity, posing or performing erotic acts
   with men, women, animals, machines, or other props.  Some say
   it degrades women, some say it corrupts young boys (who
   down-load it from the web or exchange it on
   floppy disks).  Most of it is in the form of JPEG images.
   Many websites offer porn of all sorts, almost always for a
   subscription.  It is said that these are a driving force in
   the evolution of new technology and techniques for the web.
   Advertisments for them certainly constitute a significant
   proportion of all spam.  There are even pornographic
   computer games, an early example being Mac Playmate.

   Beware - many institutions, particularly universities, have
   strict rules against their computers and networks being used
   to transfer or store such things, and you might get corrupted.

   (2002-03-08)