behalf

as the agent of or on someone''s part (usually expressed as "on behalf of" rather than "in behalf of"); "the guardian signed the contract on behalf of the minor child"; "this letter is written on behalf of my client";

for someone''s benefit (usually expressed as `in behalf'' rather than `on behalf'' and usually with a possessive); "in your behalf"; "campaigning in his own behalf"; "spoke a good word in his friend''s behalf"