distantiate
Concise Oxford English Dictionary © 2008 Oxford University Press:
distantiate /dɪˈstanʃɪeɪt/
▶verb set or keep at a distance emotionally or intellectually.
– derivatives
distantiation noun.
distantiation noun.
– origin 1940s: based on L. distantia ‘distance’.
'distantiate' also found in these Oxford entries:

