interdental [Lat. inter ‘between,’ dens ‘tooth’]

In glossematics, relation between the mutual precondition of two elements A and B, the presence of A presupposing the presence of B and vice versa. Syntagmatic interdependence (as existing between she and -s in she doe-s) is called solidarity; paradigmatic interdependence (as it exists universally between the occurrence of vowels and consonants) is called complementarity (see Hjelmslev 1943: ch. 9).