anon

Short definition from Wiktionary

Adverb

1. 1
   Straight away; at once.
2. 2
   Soon; in a little while.
3. 3
   At another time; then; again.

Noun

1. 1
   An anonymous person, traditionally especially a published author but now especially an internet rando.
2. 2
   An anonymous person, traditionally especially a published author but now especially an internet rando: An anonymous poster (“person who contributes a note, message, etc”). A participant in an online site, such as a forum or an imageboard, without an account, or who posts without identifying themselves, or hidden behind a pseudonym.
3. 3
   A work with an unknown author.
4. 4
   A work without a title.

Adjective

1. 1
   Clipping of anonymous.

Proper noun

1. 1
   The name given when an author's name is unknown.