Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Origin: by half 'on (someone's) side'

behalf

 noun
     
be‧half

on behalf of somebody

also in behalf of somebody American English
a) instead of someone, or as their representative:
She asked the doctor to speak to her parents on her behalf.
On behalf of everyone here, may I wish you a very happy retirement.
b) because of or for someone:
Oh, don't go to any trouble on my behalf.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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