What's the difference between i.e. and e.g.?
1540s, "calamitous, disastrous, fatal," shortened from tragical (late 15c.), modeled on Latin tragicus, from Greek tragikos "of or pertaining to tragedy," literally "of or pertaining to a goat," and probably referring to a satyr impersonated by a goat singer or satyric actor (see tragedy). Tragic flaw (1913) translates Greek hamartia.