/bes'chee al"i tee, bees'-/ , n. , pl. bestialities .
1. brutish or beastly character or behavior; beastliness.
2. indulgence in beastlike appetites, instincts, impulses, etc.
3. an instance of bestial character or behavior.
4. sexual relations between a person and an animal; sodomy.
[ 1350-1400; ME bestial ( i ) te ( bestialitas. See BESTIAL, -ITY ]