1 Brit. charge with a crime against the State, esp. treason.
2 US charge (the holder of a public office) with misconduct.
3 call in question, disparage (a person's integrity etc.).
Derivatives:
impeachable adj. impeachment n.
Etymology: ME f. OF empecher impede f. LL impedicare entangle (as IN-(2), pedica fetter f. pes pedis foot)
Useful english dictionary. 2012.