Thayer's Greek Lexicon

 1. to convict, refute, confute
  1) generally with a suggestion of shame of the person convicted
  2) by conviction to bring to the light, to expose
2. to find fault with, correct
  1) by word
2a1. to reprehend severely, chide, admonish, reprove
2a2. to call to account, show one his fault, demand an explanation
  2) by deed
2b1. to chasten, to punish