Brown Driver Briggs

 1. to be clean, be pure
  1) (Qal)
1a1. to be clean (physically - of disease)
1a2. to be clean ceremonially
1a3. to purify, be clean morally, made clean
  2) (Piel)
1b1. to cleanse, purify
1b  1) physically
1b  2) ceremonially
1b  3) morally
1b2. to pronounce clean
1b3. to perform the ceremony of cleansing
  3) (Pual) to be cleansed, be pronounced clean
  4) (Hithpael)
1d1. to purify oneself
1d  1) ceremonially
1d  2) morally
1d2. to present oneself for purification