Definition of Pareto-optimal in English:

Pareto-optimal

adjective

Economics
  • Relating to or denoting a distribution of wealth such that any redistribution or other change beneficial to one individual is detrimental to one or more others.

    • ‘Someone marching to the front of a queue and buying someone else's space in it is Pareto-optimal; the other people are made no worse off, and the parties to the exchange are made better off.’