The Collaborative International Dictionary of English v.0.48:

Dentition \Den*ti"tion\, n. [L. dentitio, fr. dentire to cut
   teeth, fr. dens, dentis, tooth. See Dentist.]
   1. The development and cutting of teeth; teething.
      [1913 Webster]

   2. (Zool.) The system of teeth peculiar to an animal.
      [1913 Webster]

WordNet (r) 3.0 (2006):

dentition
    n 1: the eruption through the gums of baby teeth [syn:
         teething, dentition, odontiasis]
    2: the kind and number and arrangement of teeth (collectively)
       in a person or animal [syn: dentition, teeth]