a standard procedure that is followed mindlessly;
"the union's support had been in lockstep for years"
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"
- Coherence is a unique property of quantum mechanics that allows laser photons to march in lockstep and atoms to be in two states at once.