What's the difference between i.e. and e.g.?
late 14c., "to impede, hinder, prevent," from Anglo-French empecher, Old French empeechier "hinder" (12c., Modern French empêcher), from Late Latin impedicare "to fetter, catch, entangle," from assimilated form of in- "into, in" (see in- (2)) + Latin pedica "shackle," from pes (genitive pedis) "foot." Sense of "accuse a public officer of misconduct" first recorded 1560s, perhaps via confusion with Latin impetere "attack, accuse." Related: Impeached; impeaching.