Thayer's Greek Lexicon

 1. to make clean, cleanse
  1) from physical stains and dirt
1a1. utensils, food
1a2. a leper, to cleanse by curing
1a3. to remove by cleansing
  2) in a moral sense
1b1. to free from defilement of sin and from faults
1b2. to purify from wickedness
1b3. to free from guilt of sin, to purify
1b4. to consecrate by cleansing or purifying
1b5. to consecrate, dedicate
2. to pronounce clean in a levitical sense