"behalf" in the noun sense

1. 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"

2. behalf

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"

Source: WordNet® (An amazing lexical database of English)

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