defection
1. [ noun ] withdrawing support or help despite allegiance or responsibility
Synonyms: desertion abandonment
Examples:

"his abandonment of his wife and children left them penniless"

Related terms: withdrawal abscondment absence_without_leave deviationism defect
2. [ noun ] the state of having rejected your religious beliefs or your political party or a cause (often in favor of opposing beliefs or causes)
Synonyms: renunciation apostasy
Related terms: rejection defect
Similar spelling:   defecation
  deification
  defect
  depiction
  defective
  defectively
  defector
  de_facto
  deposition
  depicting
  defecator
  depict