Posted on April 13, 2005June 15, 2006 by Helenseity, a new word for me seity – found on Karyn’s photo blog \Se”i*ty\, n. [L. se one’s self.] Something peculiar to one’s self. [R.] –Tatler. What is peculiar to myself? my fake tooth? my use of the word goose in conversation with Sean? What is peculiar to you?