conventionalism

Adherence to social conventions; conventional behavior.

A conventional act or constraint.

Having said this, you will not, I trust, suspect me of disliking you for throwing off conventionalisms and speaking to me as a man to a man.

The doctrine that logical or mathematical principles are simply the expression of conventions.

Skepticism arrives at conventionalism by way of the claims that the conditions on evidential support cannot be satisfied […] but that we must have beliefs in order to carry on.