Tooth Eruption tooth eruption, n the process by which the tooth moves from its site of formation to its position of function. It can be active or passive. http://medical-dictionary.thefreedictionary.com/tooth+eruption Posted by oralsurgery on Apr 14th, 2012 12:05 am Filed under dental definitions . You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.