¦ ̷ ̷ ˌ ̷ ̷ ̷ ̷ ˈ ̷ ̷ ̷ ̷ noun
1. : recognition of one's own self
2. : the process by which the immune system of an organism distinguishes between the body's own chemicals, cells, and tissues and those of foreign organisms and agents — compare self-tolerance herein