behalf

noun2

1. •
   The interest, benefit, or wellbeing of someone or something.

   • She appeared on behalf of the U.N. Secretary General at a conference held in behalf of the world's children.
2. •
   the position of acting or speaking for another person in their place

   • He was not only my Representative who died on my behalf; He was my Substitute who died in my very stead. — 1994