*rigorism*

n. [ Cf. F. rigorisme. ] 1. Rigidity in principle or practice; strictness; -- opposed to laxity. [ 1913 Webster ]

2. Severity, as of style, or the like. Jefferson. [ 1913 Webster ]

3. (Ethics) Strictness in ethical principles; -- usually applied to ascetic ethics, and opposed to ethical latitudinarianism. [ Webster 1913 Suppl. ]