1610s, "teething, the cutting of teeth," from L. dentitionem "teething," noun of action from dentire "to cut the teeth," from dentem (nom. dens) "tooth" (see tooth). Meaning "arrangement of teeth" is from 1849.
(děn-tĭsh'ən) The type, number, and arrangement of teeth in an animal species. In mammals, dentition consists of several different types of teeth, including incisors, canines, and molars. The dentition of toothed fish and reptiles usually consists of only one kind of tooth.