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)
   "spoke a good word in his friend's behalf"; "in your behalf"; "campaigning in his own behalf"

Derived forms: behalfs

Type of: interest, lieu, place, position, sake, stead

Encyclopedia: Behalf