Wordnet 3.0
NOUN (2)
1. 
 a standard procedure that is followed mindlessly; 
- Example: "the union's support had been in lockstep for years"2. 
 a manner of marching in file in which each person's leg moves with and behind the corresponding leg of the person ahead; 
- Example: "the prisoner's ankles were so chained together that they could only march in lockstep"
WordNet (r) 3.0 (2006):
lockstep
    n 1: a standard procedure that is followed mindlessly; "the
         union's support had been in lockstep for years"
    2: a manner of marching in file in which each person's leg moves
       with and behind the corresponding leg of the person ahead;
       "the prisoner's ankles were so chained together that they
       could only march in lockstep"