What is one Monte Carlo step in simulations?

[matematikuvol]

What is referred as one Monte Carlo step. In all books, papers people is written that was performed $5 \cdot 10^{6}$ MCS on all system sizes. Or the time is measured in MCS. But what is referred as one MCS? For example in MC simulation of Ising model what is a one MCS?

 

[mfb]

I would expect that this is one (time) step in the simulation.

 

[matematikuvol]

Suppose that problem is MC simulation of 2d Ising model with $L^2$ lattice sites. What is the one time step of that simulation?

 

[mfb]

Depends on the precision you want, I think.