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3.
A recording of one's inner thoughts and emotions. A place for one to vent their emotions/thoughts on. And also, eventually a place for someone else to read and realize the past thoughts of the previous user.
Carla wrote in her diary every night, and said what she thought about everyone around her, and how her day went.
by Anndi August 29, 2003
 
1.
A book that you can write all your thoughts and feelings in.
You can also write evil stuff about the people you hate.
People like to read other peoples' diaries.
My cousin went mad when she found out that I read her diary.
by psycho bitch March 13, 2004
 
2.
A notebook containing one's personal thoughts, feelings, plans, attitudes, observations, and the like. Written in usually at frequent intervals, usually but not always kept private.
I've kept a diary since I was 7. It's fun to read later.
by bawdy January 06, 2007
 
4.
normally a book, that ppl write in a lot, usually private things that they dont want anyone else to read, so naturally anyone who gets their hands on it has a flick thru.
bryan read my diary. again.
by fairy nuff September 20, 2003
 
5.
Things girls used to write in before blogs like Tumblr and other similar blogging platforms.
"Hey Becky, what did we do before Tumblr and Wordpress"?
"Geez, I think I had something called a diary".
by lolsummer6969 October 13, 2011
 
6.
Short for diarrhea.
Bob's toilet was full of diary.
by crazy johnny October 28, 2004