x1 is utility, the total subjective well-being/pleasure/happiness (or reduction in suffering) generated by action/event/state x2 according to psychological/philosophical/economic theory x3.
Encompasses 'utility' in both its philosophical and economic senses. For a theoretical unit of utility, or 'util', see utli. For the ethical system based on the concept of utility, utilitarianism, see utliti zei marde or utliti zei madyske.