(historical) Practical, comfortable clothing proposed in the Victorian era as an alternative to the fashions of that time.

(law) A standard for judicial review, according to which a law must be rationally related to a legitimate state interest.

The process of economic agents aiming to maximise their objectives, by ensuring the marginal benefit of an action is equal to its marginal cost.

(social sciences, economics, political science, sociology) A theory that argues individual decisions are based on that individual's understanding of the costs and benefits of a given action, shaped throughout the assumptions of self-interest and rational actors.

(algebra) A theorem which states a constraint on rational solutions of a polynomial equation with integer coefficients.