Etymology
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behalf (n.)

c. 1300, behalve (with dative suffix), "for the sake or benefit, advantage, interest" (of someone), from Old English (him) be healfe "by (his) side," and, incorrectly, from on (his) healfe "on (his) side," from healfe "side" (see half). The word was confused with Middle English behalve, behalves (adv. and prep.) "by the side of, near."

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Definitions of behalf

behalf (n.)
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
behalf (n.)
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
campaigning in his own behalf
in your behalf
From wordnet.princeton.edu