conventionalism

noun3

1. •
   Adherence to social conventions; conventional behavior.
2. •
   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. — 2026
3. •
   (no longer used) 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. — 1864