derealisation

noun3

1. •
   The psychological symptom in which the world appears to be unreal, and the patient has a sense of detachment from it.
2. •
   making unreal, in general; detachment from reality or realness.
3. •
   The loosening of the bonds of (an electron) so that it can move freely among a group of atoms; delocalization.

   • This section develops a theme mentioned […] in the previous section, namely the derealization of the unpaired electron away from the formal radical centre […] — 1976