Among the older men were many whose features showed the tigerish, lawless souls within; but looking at the rank and file it was difficult to believe that these eager and open-faced young fellows were in very truth a dangerous gang of murderers, whose minds had suffered such complete moral perversion that they took a horrible pride in their ...
http://legal-dictionary.thefreedictionary.com/perversion
1660s, one who has forsaken a doctrine or system regarded as true, apostate, from pervert (v.). Psychological sense of one who has a perversion of the sexual instinct is attested from 1897 (Havelock Ellis), originally especially of homosexuals.
http://www.dictionary.com/browse/pervert
Subscribe to our Question of the Week: Question: What does the Bible mean when it refers to something as a perversion?. Answer: Webster’s Dictionary defines perversion as “a diverting from the true intent or purpose; a change to something worse; a turning or applying to a wrong end or use.” Anything can be perverted. Using opiates for non-medicinal purposes, for example, is a perversion of the poppy plant.
https://www.gotquestions.org/Bible-perversion.html
c.1300 (transitive), to turn someone aside from a right religious belief to a false or erroneous one, from Old French pervertir pervert, undo, destroy (12c.) and directly from Latin pervertere overthrow, overturn, figuratively to corrupt, subvert, abuse, literally turn the wrong way, turn about, from per- away (see per) + vertere to ...
http://www.dictionary.com/browse/pervert
Current definitions include: (1) Sexual excitement to the point of erection and/or orgasm, when the object of that excitement is considered abnormal in the context of the practitioner’s learned societal norms.
http://medical-dictionary.thefreedictionary.com/Sexual+pervert
Another view considers that perversion is a degradation of an objectively true morality. The sense of a pervert as a sexual term was derived in 1896, and applied originally to variants of sexualities or sexual behavior believed harmful by the individual or group using the term.
https://en.wikipedia.org/wiki/Perversion
Kinds of paraphilia include exhibitionism, pedophilia, transvestism, voyeurism, and zoophilia. paraphiliac, adj., n. (1) Sexual excitement to the point of erection and/or orgasm, when the object of that excitement is considered abnormal in the context of the practitioner’s learned societal norms.
http://medical-dictionary.thefreedictionary.com/Sexual+pervert
They were just emerging from a narrow court not far from the open square in Clerkenwell, which is yet called, by some strange perversion of terms, 'The Green': when the Dodger made a sudden stop; and, laying his finger on his lip, drew his companions back again, with the greatest caution and circumspection.
http://legal-dictionary.thefreedictionary.com/perversion
Perversion is a type of human behavior that deviates from that which is understood to be orthodox or normal. Although the term perversion can refer to a variety of forms of deviation, it is most often used to describe sexual behaviors that are considered particularly abnormal, repulsive or obsessive.
https://en.wikipedia.org/wiki/Perversion
a [count] : something that improperly changes something good. 1  perversions of the truth. 2  The judge's decision was a perversion of justice. [=was very unjust]
http://www.learnersdictionary.com/definition/perversion
what's the meaning of perversion?
The meaning of perversion is a degradation of an objectively true morality. Perversion means a degradation of an objectively true morality.