Noun
1. 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";2. 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"