WordReference Random House Learner's Dictionary of American English © 2015
be•half /bɪˈhæf/USA pronunciation n. 

    Idiomsin or on behalf of. Also, in or on someone's behalf. as a representative of (someone);
    (speaking) in place of or for:On behalf of the president, who could not be with us tonight, I am happy to be speaking to you.

Collins Concise English Dictionary © HarperCollins Publishers::

behalf /bɪˈhɑːf/ n
  1. interest, part, benefit, or respect (only in the phrases on (someone's) behalf, on or US and Canadian in behalf of, in this (or that) behalf)
Etymology: Old English be halfe from be by + halfe side; compare Old Norse af halfu
On behalf of is sometimes wrongly used where on the part of is intended. The distinction is that on behalf of someone means `for someone's benefit' or `representing someone', while on the part of someone can be roughly paraphrased as `by someone'. So, the following example is incorrect: another act of apparent negligence, this time not on behalf of the company itself, but on behalf of its banker, when what was meant was there was negligence by the company's banker

'behalf' also found in these entries:

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