pervert

American Heritage® Dictionary of the English Language, Fourth Edition

1. v. To cause to turn away from what is right, proper, or good; corrupt.
2. v. To bring to a bad or worse condition; debase.
3. v. To put to a wrong or improper use; misuse. See Synonyms at corrupt.
4. v. To interpret incorrectly; misconstrue or distort: an analysis that perverts the meaning of the poem.
5. n. One who practices sexual perversion.

Century Dictionary and Cyclopedia

1. To turn aside; turn another way; avert.
2. To turn from truth, from propriety, or from its proper purpose; distort from its use or end; misinterpret wilfully.
3. To turn from right opinions or right conduct; corrupt.
4. To perform the geometrical operation of perversion upon (any figure).
5. To turn aside from the right course, way, etc.; take a wrong course; become corrupt or corrupted.
6. To become a pervert or turncoat.
7. n. One who has turned aside from the right way; one who has apostatized or turned to error. Compare 'vert.
8. n. Synonyms Neophyte, Proselyte, etc. See convert.

Wiktionary

1. n. One who has been perverted; one who has turned to error; one who has turned to a twisted sense of values or morals.
2. n. A sexually perverted person.
3. v. To turn another way; to divert.
4. v. To turn from truth, rectitude, or propriety; to divert from a right use, end, or way; to lead astray; to corrupt
5. v. To misapply; to misinterpret designedly.
6. v. To become perverted; to take the wrong course.

GNU Webster's 1913

1. v. To turnanother way; to divert.
2. v. To turn from truth, rectitude, or propriety; to divert from a right use, end, or way; to lead astray; to corrupt; also, to misapply; to misinterpret designedly.
3. v. To become perverted; to take the wrong course.
4. n. One who has been perverted; one who has turned to error, especially in religion; -- opposed to convert. See the Synonym of convert.

WordNet 3.0

1. v. change the inherent purpose or function of something
2. v. corrupt morally or by intemperance or sensuality
3. v. practice sophistry; change the meaning of or be vague about in order to mislead or deceive
4. n. a person whose behavior deviates from what is acceptable especially in sexual behavior