perversion

Short definition from Wiktionary

Noun

1. 1
   The action of perverting someone or something; humiliation; debasement.
2. 2
   The state of being perverted; depravity; vice.
3. 3
   Distortion or corruption of the original course, meaning, or state of something.
4. 4
   A sexual practice considered abnormal; sexual deviance.
5. 5
   Tendril perversion.