Wordnet 3.0
NOUN (1)
1. 
 (geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other; 
- Example: "they built it right over a geological fault"- Example: "he studied the faulting of the earth's crust"[syn: fault, faulting, geological fault, shift, fracture, break]
WordNet (r) 3.0 (2006):
geological fault
    n 1: (geology) a crack in the earth's crust resulting from the
         displacement of one side with respect to the other; "they
         built it right over a geological fault"; "he studied the
         faulting of the earth's crust" [syn: fault, faulting,
         geological fault, shift, fracture, break]