in/on behalf of, as a representative of or a proxy for: On behalf of my colleagues, I address you tonight.
2.
in/on someone's behalf, in the interest or aid of (someone): He interceded in my behalf.
Origin: 1400–50;late Middle English;Middle Englishbihalve, earlier as adv. and preposition with the sense “near(by),” orig. as prepositional phrase bi halve on one side; see be-, by, half
interest, part, benefit, or respect (only in the phrases on (someone's) behalf, onor US and Canadianin behalf of, in this (orthat) behalf)
usage 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
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a scrap or morsel of food left at a meal.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.