noun

behalf

bih-HAF/bɪˈhæf/

The interests of someone being represented or supported.

The adult speaks on behalf of an elderly companion at the service desk.

An adult speaks at a service desk on behalf of an elderly companion seated beside them, gently indicating companion while clerk listens.

Etymology

The original image was being “by someone's side,” which became acting for that person's benefit or interest. Here half preserves its older meaning “side,” rather than an equal division.

In context

Sadhguru36:45

On behalf of all you I extend a very warm welcome to him

Cauvery Calling Live in Coimbatore - Sep 17 @ 6 PM

More examples

Thank you for the effort you made on our behalf.
The lawyer acts on her client's behalf.
He accepts the award on behalf of the whole team.

Similar words

interest: Names what benefits someone rather than the act of representation.
stead: Means in someone's place, usually in a different fixed phrase.