But bitcoin is not laissez-faire... it is a Free Market currency.
Laissez-faire is classical liberalism which still had central authority via a central State. Bitcoin is P2P so it is a Free Market currency.
There is no
one definition of the term. It comes from the French for
allow to act.
A common definition of it is: the practice or doctrine of noninterference in the affairs of others, especially with reference to individual conduct or freedom of action.
Whether one wants to see that as some kind of centralized State control is a separate matter which does not change the actual meaning of the term.
Anarchists use the term all the time and most of them most definitely are not in favor of any kind of State control of anything.