enantiodromia

 
Pronunciation: /ɪˌnantɪə(ʊ)ˈdrəʊmɪə, ɛ-/

noun

[mass noun] rare
  • the tendency of things to change into their opposites, especially as a supposed governing principle of natural cycles and of psychological development: the remorseless enantiodromia between good luck and bad

Origin:

early 20th century: from Greek, literally 'running in opposite ways'