From Fan History Wiki
Yuri: American fan fiction communities: Female/Female erotica fan fiction. Current American usage not related to origins. Origins: 1971, Anime, Barazoku magazine.
Though should note that this is not entirely 100% accurate as there are multiple citations for this...
- Yaoi is an acronym that stands for "yama nashi, oshi nashi, imi nashi" which means no climax, no point, no meaning. It was originally used to describe a manga or doushinji story which had no plot other than to get two male characters in bed with each other. In the transition to the West, it came to be used for text stories as well. Yaoi in itself is a mainly doushinji innovation for such popular manga as Yu*Yu*Hakusho (YYH) and Gundam Wing (GW), a doushinji being a comic based on a particular manga drawn by fans. For original yaoi manga, the term june is more appropriately used. For Western fans, they may be more familiar with the term "slash" which is similar, but not the same as yaoi. The term yuri means basically the same thing, but refers to female - female stories instead. 
- Yuri: A label found on fanfic, fanart and sometimes even site content—should be considered as a very serious warning. The other (female) side of yaoi—f/f slash (fem slash).
- YURI - this means "Shoujo ai" Like YAOI, this entails homosexual love...only this time, between girls. 
- Yuri: Girl/Girl Relationships. Basically girls loving other girls. I'm not sure I'll have much of this on my site though...sorry for those of you who like it ^-^ 
- YURI/SHOUJO AI
- A type of fic implying girl to girl relationship. Again, we don't write or read or host this kind. Like yaoi, it's an X instead of a slash (/). So it would be CXB (ChichiXBulma) and the like.
- Yuri: Female/female relationships 
- Yuri: Anime fanfic term for girl/girl relationships. Can include sex. 
- yuri Involves a female-to-female relationship often synonymous to shoujo-ai, but more erotic in nature.
- Yuri: Love between women, particularly of a sexual nature.
- YURI: In anime, a distortion of YAOI, referring to PWP stories about lesbian relationships, often tragic.
- Yuri is basically the same thing as yaoi, except it is focused on women instead of men. The funny thing about Yuri is that no one can seem to pin-point the reason why lesbianism in anime/manga is called Yuri. Some think it was named in honor of a girl named Yuri, which means Lily in Japanese. 
- Yuri: the same as yaoi(see Yaoi above), but with the romance relationship being between two female characters. Yuri relationships are also refered to as "shoujo-ai," meaning "girl's love." 
- Shoujo-ai/Yuri = girl x girl love. Shoujo-ai is fluffier and lighter than yuri 
- Yuri - Means "lily"; the more graphic form of shoujo ai 
Below is a partial timeline of events that took place in this fan fiction community.
- On January 29, 2001, the LiveJournal community yuri was founded.  It was dedicated to f/f anime pairings. Fan fiction communities represented include but are not limited to: Avatar: The Last Airbender, Card Captor Sakura, Iono the Fanatics, Kashimashi, Neon Genesis Evangelion, Rule of Rose, Saigo no Seifuku, Sailor Moon, Simoun, Starship Operators, Strawberry Panic, Tetragrammaton Labyrinth, Yamaji Ebine.
- On May 21, 2004, the LiveJournal community yuri_fans was created. 
- On September 18, 2004, the Digimon LiveJournal community digimon_yuri was created. 
- On February 28, 2007, prolific yuri community member Philip Mak died.
- On February 26, 2008, the Mainichi Daily News ran an article about yuri. 
Below is a partial list of articles and academic sources to help you continue to learn about this fandom community.
- Connell, Ryann. "Lesbian Manga and the Art of Gilding the Lily." Mainichi Daily News 26 Feb. 2008. 26 Feb. 2008 <http://mdn.mainichi.jp/culture/waiwai/news/20080226p2g00m0dm011000c.html>.
- Sabucco, V. (2003). Guided fan fiction : Western 'readings' of Japanese homosexual-themed texts. In C. Berry, F. Martin, & A. Yue (Eds.), Mobile cultures : new media in queer Asia. Durham: new media in queer Asia.